German was very responsive even in the Christmas eve. The location of the apartment is amazing. You can go by walk to everything and there is a supermarket 2 minutes away that is always open.
There were some constructions in the street when we were there and they only worked over night and the noise level was too high, but we were just unlucky with timing I guess.
The apartment was not as clean as I expected. The sheets were very old and dirty. And there was no soap in the apartment.
The sofa bed in the living room is broken. So the 5th and 6th person have a hard time sleeping. Make sure to get that fixed before your arrival if you are more than 4.