Fun, funky apartment on the north side of Mitte. Very high ceilings give it a very open feel and Karsten has decorated it with great 'shabby chic' furniture. It's on the ground floor but the street is very quiet so noise was not an issue. Quite a large kitchen but without a full stove so wouldn't be great if you wanted to cook much at home (but why would you want to do that with so many fantastic restaurants in Berlin).
Overall it worked very well for my stay.