This place is located in the lower level of the Ringer Center mall at Frankfurter Allee. If you look at the menu picture, you'll see why we went to this place. The menu clearly advertises "vegan buffet", and the owners can clearly understand English / point out which items are vegan.
It's not the best food I've ever had, but it's good and cheap, which are important factors. Add to that a great central location, and this spot is worth going to when you're tired of the same places in Berlin over and over.
Cons: Serves meat