There are a few other options besides the Generator. Here they are:
Wombats
Meininger
Generator
Many of us know that the Generator in London was a shithole, but I'm not sure how the one in Berlin is. As for the other two, I've stayed at both in Munich and they were aces. Again, not sure how the ones in Berlin are. All three have bars, which I think is a must for any KATG event.
Thoughts??