The room is very nice, big and comfortable. Very bright when the sun shines (so I hope you don't mind some light in the morning). The location is perfect if you want to sightseeing. Very enjoyable walk to both Brandeburger Tor and Potsdamer Platz. Very nice and quite neighborhood.
I have been just for 2 nights and I was most of the time in the city so I didn't really need to use the flat except for sleeping and having a shower (even if I have say the rest of the flat was not as cozy and clean as the very nice room).