Alex and his associate Michael were very helpful from start to finish. I was there for five weeks so I had a strong impression of the apartment and the neighborhood, and I found them both very pleasant and comfortable. The neighborhood is quiet but reasonably close to many activities; it's not all right outside your door, but all pretty easy to get to. Wifi was slow sometimes but that seems to happen everywhere we travel now. All in all, a very good base for enjoying and exploring this part of Berlin. I would happily stay there again!