One thing you can do that doesn't cost the word is to get a petition out, putting a letter through the letterbox of those on the lower floors (printed/photocpied, who cares), asking those concerned to contact you by phone/sms or by signing the form. Like Kim said, together you are much stronger, and chances your complaints will be listened to double if you kick up a really big fuss. Been there, done this before ;)
Urs Esser ● 4684d