If it is so bad as you insinuate, other neighbors will have the same complains. So I understand that you want a petition with many signatures. But are you the right person to initiate that? You need help with the language and you seem not completely familiar with the Finnish culture and how things are done here.I was just asking to complain about the situation not because I am an insane person but just because actually my apartment has some strange neighbors ". That is the only reason who makes me complaining about things all the time.
Better talk with some other neighbors first and see what they think about it. It will give you insight if your claim is legit or that you are to sensitive. Then take it from there. (writing a petition or moving out in the woods)
I actually don't understand why you ask here while you have neighbors who you want to join in. They could have easily wrote the thing for you.
Then on quiet days, we hear one kid playing some game which involves a marble bouncing onto their wooden floors. That, to a sensitive soul, is akin to water torture.
