We had quite a few problems during this stay, but they were not the hosts' fault and they were quite responsive in addressing them. For example, the internet service failed for our last 6 days. Vodaphone told the hosts that it was a network issue but was very slow in clearing it up. So the hosts provided us with a cellular hot spot so we could at least have basic connectivity (although we could not stream movies etc.). There was also a serious maintenance issue when we first arrived, but the hosts addressed it rapidly.
Most other one-bedroom AirBnB apartments we found in this price range were "smoking allowed", which we really wanted to avoid. The tradeoff is that the apartment is rather oddly designed. In particular, the washing machine is in a second, basement level that can only be reached by a very steep stairway that is almost a ladder. The desk workspace described in the listing is also in the basement and harshly lit, so I did not use it. The rest of the space is on the ground floor and certainly big enough for two people, although the layout isn't ideal.
The neighborhood is not Berlin's most exciting, but it's reasonably quiet and the apartment is near a pleasant car-free square with four restaurants and an ice-cream store (which is good, as is the smaller of the two french restaurants, although it is frequently booked up). Children playing in the square lend a nice atmosphere to the area. A few blocks away is one of the few good Asian restaurants we experienced in Berlin (Indian).
The apartment is also near the Berlin "Thai Park" which has Thai street food Friday - Sunday. The food there is generally better than Berlin sit-down Asian restaurants offer.
Both the U3 and U7 are nearby, plus several buses, so getting places is relatively easy, although reaching some of the attractions in the Mitte / Alexanderplatz area is a bit of a hike. I had business in the Southwest corner of the city, so the location was generally good for me.