The apartment is spacious, well furnished and clean; wifi was a bit slow but it was working nonetheless.
There was a problem with the heating system and the oven at first but they got us portable heaters for each room until the heating was fixed; though the oven took a long time to fix but a new unit of stove and oven were set up sometime later.
We had some issues when communicating with whom we met during check-in and out since they did not speak English, but we managed to get around that and everything went smooth.
The apartment is around a 10-15 min walk to Spandau bahnhof, which is a big station so getting anywhere was no problem.
Overall our stay was more than satisfactory with respect to the host as well as the apartment itself.