Oh you are definitely not alone. There are many things to like about my condo but two things that I cannot fix persist in making me unhappy -- food odors from downstairs and next door and the fact that I hear every single footstep from upstairs. And don't get me started on the toilet seat slamming upstairs. EVERY SINGLE TIME. Sometimes twice in less than a minute. I can hear it from every corner of my house. Is she angry at the toilet seat? Punishing it for bad behavior?

Anyway, recently I was trying to read in my living room when the neighbors came home and started slamming stuff. I went and got my white noise machine from the bedroom and turned it on, and that helped. The other thing that might help is earplugs.

Good luck!!