Overall it was a great experience. The room was nice and clean, with a private bathroom and a huge terrace. Mine was very friendly and accommodating as well.
The only thing that could have made my stay slightly better is if the location was closer to an S-Bahn or U-Bahn station, so that one did not have to take the bus (1 min away) to Zehlendorf to get to either the S7 or S1 train. However, Mine was very upfront about this and even double-checked with me before accepting my booking.
As one other review points out, there are kids in the house, however, this never turned out to be a problem for me. The kids were well behaved and did not make much noise at all.