I highly recommend to stay at Petra’s for your visit to Berlin. She is a very caring and respectful host that will try to make your staying in her house and also in the city, a very pleasant one.
The room is very nice, spacious and well illuminated. Finally, I can say that the location is perfect, very close to public transportation and a safe area. Berlin is the loveliest city, but staying at the right place will make it even better!