Met the neighbour below me last night. Didn't get to chat for that long as he was cooking dinner, but he seems really nice. He suggested we go out for a few beers at some point. Apparently he was around for the party and found the music was a bit loud, but he fell asleep so didn't come and complain. He certainly didn't mind me having a party though.
Haven't met any others yet, but he told me that the neighbour that came 'round and ranted lots is actually a nice person. She must have been REALLY having a bad day or something.