Ralph's apartment is very well situated and ideal for a group. We had a lot of space, the beds were comfy, the kitchen well-equipped and very clean. The place is near some of the busiest and most exciting streets of Kreuzberg, and yet it is quiet, since separated from the street by a pretty communal garden. Communication with Ralph was easy and friendly, and our host proved flexible when it turned out we would arrive later than expected because of a train strike! Definitely recommended!