I had a nice stay in the apartment. Tidy place, easy check in/out, a car garage underneath for the car and a well organized apartment hotelroom. I liked it. The host was very helpful and nice as well. I'm a wheelchair user, and the place was close to perfect for me without it being designed to be. Only not accessible thing was the balcony, and the fact that the shower was in a bathtub. That's not a knock on the apartment, and wasn't really a problem for me since I'm mobile. Just information for potential future wheelchair user.
Next time I'm in Berlin I will definitely try to book this place again.