We booked this place with six people, mainly due to the price as it was fairly cheap. It is located in a residential area (very family-friendly) in a kind of a basement in a house. There is a separate entrance to the "basement" with two bedrooms (three beds each), a kitchen and a bathroom. Interior design is minimal and so is the equipment. In the bedrooms you will find beds, towels and bed linen, a night stand and a tv. Kitchen has a few pots and pans + plates and utensils. All in all very basic but caters to your basic cooking needs.
I think the main problem was the location. However, it was our own fault as we had not checked it more closely and just went with the price. It all depends on what you're looking for on your trip to Berlin. The house itself worked and the place was clean.