I have spent few days in Berlin recently and found a nice small pizza restaurant which was very good.
So, after Il Campionissimo in Paris and Franco Manca in London, I recommend you 'A Magica in Berlin :)
It is small and you will probably need to share you table with strangers but it was delicious!
While I'm on the topic I'll shamelessly advertise my Berlin photos.
Before...
Chris Kühl [You should also try Pizza Nostra[1]. It's actually only a few blocks from the above mentioned Zia Maria, so you can ki..]
ao2 [Ah if you are a great fan of Pizza consider a visit to the city of Naples, Italy, where the Pizza was invented. I can..]
abral [There are a lot of great pizzerias in Naples, like http://www.accademiadellapizza.it/en/, http://damichele.net/?lang=e..]