A very nice place to stay. The appartment is open (no doors) with a lot of light. From the roof top you have a great view on Berlin (most houses have the same height, so you have a great 360 degrees look). The appartment is well equiped but in our opinion only for four persons (so it was perfect for us; we travelled with four).
The place is very quiet; almost no sound in the evening and night. We took 4 bicycles with us to discover Berlin. Almost all places to visit are within 30 minutes. With the car it will not be any faster. Car parking is expensive and make sure you have the green vignet for your car (we forgot).
The host was very kind and helpfull and answered my questions very quick.
So a great place to stay and to explore Berlin.