Originally Posted by
banzani
Think twice if you really need a car. There is fantastic public transport around the clock, and using taxis is not expensive either. If that is a possibility for you I would try to not have a car, and only rent it on the day you are leaving. Of course I don't know if that would work for you, so just a thought.
+1: I have always stuck to public transport in Berlin if at all possible- it is excellent, and as noted extremely un-expensive.