The place is nice and well decorated. The neighborhood is residential and rather quiet. It might be difficult to find a parking, but after 15 minutes of circling around we always found something.
In the winter it might get cold. This is not special to this particular apartment. There are AC with heating installed, so you can heat up the place, but it takes a bit of time.
The only place which remains unheated in the winter is the bathroom. For the winter I would suggest installing a small heating fan there. Also the shower is rather tiny, which might be an issue for some people.
In general, we enjoyed our stay, and we would like to thanks Andreas, who was helpful and responsive.