Berliner here, working in Kreuzberg. Text me "Germany + 171 as net provider + 19 48 58 0" either Whatsapp or iMessage or johannkaupen at Google Mail more details and I'll help you!
Additionally: you'll find help on WG-Gesucht.de // most of the stuff is in German, but some are texting in English too and Most will ne Sperling German.