allright.. i was told that the thing with "legal" walls in Berlin is a bit tricky.. mauerpark seems to be the most legal spot to paint.. i was told about another one but i haven't been there..
most photo's from this serie are from the area next to the warschauerstrasse train station.. i think you can paint there but you'll probably have to check that with some local peeps around there.. there's a skatepark there to.. maybe you can ask the people there what's up with the walls there..

Yeah.. that's me :) (and some friends)