Although the one in Grünbergerstr is good, I prefer the one in Boxhagenerstr. People working there are very very kind. You can custom almost all of the dishes, if desired.
The atmosphere is great thanks to their non-stop quality reggae.
Especially good the vegan teller, where you can try a big variety of things, everything delicious. Outstanding the soups, falafel and the lentil rolls.
Ridiculously cheap (For 5/6€ you'll be full!) Almost everything is vegan or can be cooked vegan.
Cons: Just two little biscuits as dessert