I had a 2 month stay at the apartment, it is comfortable for long-term as a single and possibly couple. I would be happy to stay again, and aside from a few things different to my expectation, it was a really nice flat and enjoyable location to stay. Karin and Tom were excellent hosts and timely with communication, checkin was really easy, and they were quick to assist with my queries.
I was surprised by the actual location, which is quite far ~500m outside the blue circle shown by the airbnb map (but located as described in Karin's listing description). It is very much closer to Mauer Park and Oderburger Strasse than shown by the map. I nearly complained to airbnb about the location but, after looking into the area and all the positive reviews, I am glad to have stayed because it is a really great cafe & restaurant district. It is also convenient to a tram line, and Mauerpark is great for a walk/jog, to have a picnic, and for the weekend market.
The apartment has plenty of sunshine and fresh air if you want, also with blinds for privacy. The amenity of the apartment was great (especially the shower! and good options for cooking in the kitchen). The internet speed is 12Mbps down / 1Mbps upload, and although listed there is no air-conditioning or cable TV. I would be happy to stay there again :)