Ah memories of apartment life!
We heard scratching at our door on the 3rd (top) floor one day. It was a small dog. When I opened the door and he saw me, he turned and headed for the stairwell door. I opened it for him and followed him to the second floor. When I let him into the hallway, he went to the apartment under ours. Turned our his owner would let him out and he would wait his chance to get back into the building, but he couldn't count. and would sometimes end up on the wrong floor
There were always kids running around and one little girl in particular was never where people expected her to be. We soon got tired of hearing people calling "Aaaaaaprilllllllll!"
In another apartment, the fellow upstairs seemed to have trouble getting around without running into things in the morning. We soon came to think of him as "Stumblebum". One Christmas they gave their daughter a keyboard and we had the pleasure of hearing the girl pacticing "Silent Night" over and over and over..
Our house these days is 1/4 .mile from our nearest neighbor.
We don't hear them.
Best
Les