We very much enjoyed our stay in the apartment - it was compact, superbly heated in the Berlin's frost and adapted to our needs - a family of five. Great location close to the center, supermarket nearby, 24/7 pizza and kiosk on the street.
It should be taken into account that there are no doors between the rooms, that the windows are at street level, and that it is impossible to completely darken the sleeping areas in the morning. It didn't stop us from absolutely enjoying our stay and we would love to come back again on our next visit to Berlin. Thanks!