That was the case for me as well, back when I moved to Munich in 2012. It also helps if you speak at least some German(I didn't), and send emails in German(just ask some colleague or friend to fill it for you). Also, in the end(it took me roughly 3 months to find apartment) I just had a stack of papers which basically would tell everything about me. I dunno if it helps, but I have heard Germans like bureaucracy.