The apartment was damp, mouldy, and smelled musty. It is on the ground floor in an older building, which likely explains the damp and mould. The double bed is small, and not particularly soft or comfortable. The futon on the floor is so thin, it may as well not be there. The apartment was dusty, and the carpet was not clean (had quite a bit of hair on it that was not ours) - not nice to sleep on it, on the floor mattress. The towels provided are obviously stored in the apartment, as they smelled musty too. There is a washing machine at the back, so we washed the towels after the first use.
We complained to the host about the mattress and lack of cleanliness/mould, and a deep clean of the apartment was offered while we were there (which we didn't want, as all our belongings were there, and the apartment needs a deep, thorough clean). An additional mattress was apparently not possible at the time we were there, but I hope they have improved this since our stay.
We left early to other accommodation, and I have made several suggestions to the host to improve the accommodation, in order to make it comfortable, clean, and cosy - as it is advertised.