Don't have any suggestions but can empathise. We live in a small terrace house with a party wall with next door. Wooden floorboards and they are constantly thumping up and down their hallway, slamming their door & gate all day & night. Drives me mental. I haven't said anything, and probably won't. They argue quite a bit too so not something I want to start with my neighbours. Yours sound a bit more approachable [emoji3].