My family stayed at Ronia's place for a week in the end of June, and I would say this flat is perfect for two or even three people: one extra mattress is available.

Among the doubtless advantages of this place are: low price; good location (nice area, 3 minutes from UBahn/bus stop, 15 min w/transport to Zoo); the living room is big and full of light, and everything you need for cooking is on the kitchen. We were met by Ronja's sister, who was helpful and friendly, and what I really appreciated was the flexible time of moving out.

There were some points to criticize, though; problems with water is one of them, because one could never know if there is hot water in the shower or not. The host said later that it could be fixed, so I guess next guests will be more lucky. And no internet at home is not a problem in Berlin, there is a nice cafe on the corner with wi-fi connection.

To sum up, my family enjoyed their staying in Berlin a lot, and I would definitely recommend Ronja's place to everyone.