In every place you wish to sleep in clean sheets, don't you, but if you are charged the additional fee of 25 EUR you have the right to expect the apartment to be just spotless. We had to clean some residues from the toilet, alright, maybe the cleaning lady did not do the best of her job. But I was really shocked to hear my kids tell me that the sheets smelled of someone else who had slept there before. And yes, it definitely wasn't the smell of fresh linen. Yuck! It was late, we were exhausted and simply not in the mood of explaining the situation and then possibly moving somewhere else, so we stayed there. It was a warm night, so we did not bother to use the linen provided.
My overall opinion would be far better (the location is OK, the wifi also, as well as the decor inspired by S. Freud, we have had everything clearly explained by Christian), but the apartment seemed to be cleaned very superficially from a long time. Overall it was not a good experience for us, we were just disgusted.