Great pizza, terrible service. Part of the anarchist pizza network that includes Il Casolare in Kreuzberg and Il Ritrovo in Friedrichshain.
I prefer the much more friendly Il Ritrovo in Friedrichshain. Best pizza in Berlin!
We were there after the first day of LinuxTag 2010. They don't reserve tables on the patio, just inside. Big choice in meals and drinks on the menu. Tasty and big pizzas. Service was ok: not fast, but friendly and helpful.