Paranormal or not?

My memory for exact dates for most of these odd events is hazy, but I've given the closest approximation (with my rough age in brackets) where possible:

1976 - (14) I was up in Aberdeen visiting my grandmother with the rest of my family. However, for reasons of space, my brother and I were going to stay at the flat he was renting at the time in Carden Place, Aberdeen. It was a basement flat, accessed round a courtyard at the back. When my brother and I arrived at the flat, we realised I'd forgotten my pyjamas and he went back to my grandmother's to get them, telling me just to go into the flat.

For some reason, I was unable to and waited outside for him to come back. The place totally gave me the creeps: there seemed to be a really nasty presence in it that didn't want me there. Reassured by my brother's return, I was just feeling like a wuss when my brother told me the place spooked him completely too; that there were weird bumps and bangs in the middle of the night and so forth unlikely to have been caused by the old lady upstairs who was the landlady; and that the piano played by itself in the middle of the night. That was all really helpful. Amazingly, I did eventually get to sleep that night. No piano.

Sceptical explanation: I was just being a wuss. My brother was having a laugh.

Counter argument: My brother, who's 9 years older than me, could see I was distressed and isn't the type of brother to make that stuff up. He confirmed it many years later. I'm not usually such a wuss that I can't stay in a place on my lonesome.

Conclusion: Some places have a really unwelcoming atmosphere. This was one of them.