Matthias was very welcoming, his sister met us at the door and showed us around. She was very nice to us and was able to communicate perfectly. They both answered our questions right away and were easy to talk to. The flat is beautiful, and looks exactly how it does in the photos. The beds are very comfortable, and the kitchen is well-equipped. It would have been nice to have a microwave, but the oven works well. The neighborhood is nice, the flat is near a lot of good restaurants (and next door to a supermarket) and is a short drive away from many historical sites. Great to come back to after a long day sightseeing. Overall, it was a wonderful stay and I would definitely like to stay in Matthias' house again when I come back to Berlin.