It is really spacious. There is a bedroom on the first floor and a second bedroom on the second floor. Just entering the apartment there is a hall and half a bathroom to the right. In the next room you have the kitchen and the dining table. The kitchen was very well equipped. Only thing we found missing was a microwave. At the end of the room is the door to the 1st bedroom. The stairs are in the kitchen (and go above it).
The second floor has very spacious living room/TV room. To the left you will find the bathroom. And to the right of the living room is the door to the second bedroom.
The best for me was to have that separation of spaces and of course the location. You can walk to Museum Island or you could take the S-Bahn or U-Bahn just by walking 100 or 200 meters.