In the end, we changed the location after 4 nights (11 were reserved).
It is not obvious that the appartment is basically a basement appartment, with a musty smell. Even the cupboard in the kitchen had a strong musty smell. Additional we had problems with the bathroom, the toilet was leaking, so the most of the floor was getting wet. We ordered sheets, but only got one blanket with the size of 150x200 cm, which was too small for a couple and we didn’t get another one despite demand.
However the owner was cooperatively but we expected something else. The announcement of a small refund was not fulfilled.