super thin floors/ceilings
Pros
I loved the location and the aesthetics of the building, and the size and layout of the apartment. We had a balcony, the kitchen was great, and it was very sunny.
Cons
We could hear our upstairs neighbors feet constantly. The floors/ceilings are constructed with no sound proofing and it's extremely noisy.
Advice to the owners
I'm not sure there's anything you can do about that. Even rugs don't help much.