Due to (not quite so) popular request. I finally opted to write down the experience I had with a haunted house my wife and lived in (rented) when we were first married....

Just before getting married, I was living in my camper on the back of my pickup truck, in the back field of a semi abandoned old house due to be demolished that a friend of mine was staying in while building his band, and my wife was still living with her parents.
The first two weeks of marriage after our honeymoon, we spent living at her parents, while I frantically scrambled to find us somewhere fast to live. Don't get me wrong, her parents are great folks, and were very welcoming, but I've never been comfortable living in someone else's house (even my own parents), so I was quite insistent on getting a place ASAP. This unfortunately affected my judgment in picking our first abode together.
The place I found was very cheap and immediately available. It was an 80+ year old house that was semi-renovated (poorly) to be split into 4 apartments.
We ended up with the apartment on top that had two bedrooms, a tiny kitchen, a fair sized entry/living room, and a balcony that had been converted into a storage room that I used as an office and storage.
It was on central/shared air for heat, and the other tenants smoked (we found out later unfortuantely) and so their smoke came through the vents so we kept them taped up most of the time, and there was no air conditioning.
This was in Salt Lake City, Utah, near the University of Utah, around 1200 East and between 1st and 2nd South, around 1995-1997ish for those who know the area at all.
Ironically, I had lived in a room in a house next door a number of years before, I had nicknamed it the "Hobbit Hell Hole" because the rooms being rented were only big enough for a hobbit in my view, and it was always under construction, and sucked, but the room was only about $75-150/mo (I upgraded later to slightly larger room thus the price variance), which at the time was all I could manage. That was around early 1991ish.
The next door upstairs neighbor was a Vietnam Vet who was on disability from exposure to Agent Orange, and was a nasty alcoholic.
The landlord and he for some reason didn't like me at all, but liked my wife.
The landlord was a slumlord, and had registered the house with the local "Heritage Society" which was apparently a step down from the "Historical Society" registration. It allowed him to not have to bring the place up to code (electrical, plumbing, structure, etc.), but wasn't requring him to restore the place as would The Historical Society require.
So, we lived there for about two years, had our fist child there (William).
I had an uncomfortable feeling about the place from day one, but couldn't place it, and was too desperate trying to find a place fast, so ignored it.
I shouldn't have done that, it's become abundantly clear over the years (especially according to my wife) that when I allow myself, and let the "barriers" down, for some reason, I can pick up on left over "feelings" in a place. Whether that's crazy/quackish whatever, these "instincts" have had some very interesting results, and my wife has been around long enough now to insist I not ignore them as is my wont.
So time passed, Karina was getting verrrry pregnant, and very unhappy, The 100+ degree weather of the summer was hell with no air conditioning and her incubating.
William had a rought start, and I feel a lot of guilt for that, because I think the house had a lot to do with his (and her) distress those first two years.
I started to get very concerned when William wouldn't sleep at night unless we were holding him. And I thought he kept choking in the night, and was constantly jolting awake to check on him. He always seemed afraid, and to be looking at things we didn't seem to see.
One night I went into the room, and saw an old women over him, staring malignantly at him, hands on his chest.
She was a very faint, translucent, but clearly recognizable, image of an old woman. She didn't turn when I entered, just faded I away.
That freaked me out, and as soon as she faded, William started crying, and I realized he had been having trouble breathing up to that point while she was there.
We moved his crib into our room with us at one point, I can't remember if that was before or after.
I started going around at night when Karina was asleep, quietly mumbling, "Don't hurt them" "leave them alone" "what do you want?" etc. I also doubted my sanity considerably, and put off what I'd seen as maybe a self-delusion, even though this wasn't the first such experience I'd had in my life like that. I didn't dare share this experience with anyone.
On another occasion, one night while I was sleeping, and suddenly felt like I was being watched, my old street instincts weren't as dulled as they are now many years later. I opened my eyes, and that old woman was staring me right in the face, only a few inches away from my face. This freaked me out needless to say, but I froze. Her face was heavily wrinkled, and full of anger. She obviously (just a "feeling") didn't want us there, I still don't know much of the whole story about her though. I don't know if I actually spoke, or just strongly thought "LEAVE US ALONE!"
She just scowled, as I looked through her translucence.
My heart pretty much stopped, as I realized I wasn't dreaming this, and was really seeing her, and could FEEL the malice just pouring out of her at me.

I finally managed to get enough feeling and will, to glare back at her instead of staring in fear, and started to stand up to her, as soon as I moved, she stood back, glared even more maliciously, then faded away. I went and quickly checked on William, who immediately started crying again as I approached. Actually, he may have been crying before that, but I wasn't aware of it until then.
I was freaked out, but determined not to tell my wife. One reason was that I stil l doubted the sanity issue, and so didn't want her thinking her husband had gone nuts in the first years of our marriage, and on the other hand, if it was "real" I didn't want her freaking out.
However, within days or weeks, I found out that indeed at one point, an old woman had lived and died in the house, and since I hadn't known any of that prior to this, that was it for me.
After that, I worked furiously at trying to get us out of that place, and finally moved us out of there.
I didn't see her during that time anymore, but I kept feeling the negative pressure weighing down while we were still there. William still rarely slept properly there, was always upset, and Karina said she had always been scared to be alone there at night (I didn't tell her about his until years later, she was understandably upset with me about that).
After we moved, things became a lot better for William's sleeping, Karina's stress, and how things "felt" in general.
That was definitely the scariest paranormal experience I've had, and hope never to experience anything like that again.
Hopefully no one thinks I'm looney tunes, and hopefully it's not a big mistake posting this on the site, but it's come up enough in online and personal conversations, that I figured I consolidate the information here. I'm still very skeptical about many of these things, maybe mostly in denial, because the feelings are so unpleasant, having that level of "sensitivity" freaks me out, and it takes a lot to keep from being overwhelmed in some places, so I've done my best to supress it over the years, for better or worse.