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Was there last weekend, only got time to check few places:
The Bird
http://www.thebirdinberlin.com/
Great american hamburger (recommended here too: https://goo.gl/yi95GS)Hermanas wine bar
Warschauer Str. 81AYou can find good recommendations on the book above, I usually check it when travelling, it doesn't just list starred restaurants, but anything from a street stall or dirtiest restaurant to the most starred one, it's just where food is good.
think munich, dusseldof, berlin, and maybe one other...