I always checked this web
http://www.immobilienscout24.de/de/finden/wohnen/index.jsp
the only problem is that is in German, but is the one i used to search for mine.
독일 공개토론 < rent apartment or studio in Berlin
http://www.immobilienscout24.de/de/finden/wohnen/index.jsp
the only problem is that is in German, but is the one i used to search for mine.