The location for this apartment is fantastic - easy to the train station, very close to a number of tram lines, and a great location to visit Christmas markets. It was a comfortable size for a family of five.
As explained beforehand, this is a very barebones apartment, so we knew to bring our own shampoo etc. I wish we had thought to bring some type of tea or coffee for first thing in the morning. I wouldn't rely on being able to cook much in the kitchen -- the first night we tried to cook a store-bought pizza in the oven and had some issues finding things like oven mitts and functional spatulas.
There are black spots/growths on the ceiling of the shower which looked like mold, but otherwise the apartment was clean.
The check-in process was easy and straightforward.