We have enjoyed our stay in this apartment, the sheets and rooms (bedroom, bathroom) were clean and tidy, we couldn't spot a single dust or mold. However, in one of the rooms there were spots on the couch, and it was not set for us, but if we would have wanted to, it would have been a bit dirty. There was also a bed cover inside, which had a stain of some sort.
Overall it is a pretty decent choice, it is really well equipped both kitchen and bathroom-wise and with the exception of the 1 couch it is very neat. The placement is also pretty convenient with a mini market opposing side and 1 minute walk from the Wenceslas Square.