I stayed at one of these apartments with my wife for 10 days. The quality of the furnishings and equipment is very good, with a very comfortable bed. I could not suggest anything which could be improved, but there was one drawback, the sound insulation. In our upstairs apartment there was a double connecting door to the next one, so that families can be accommodated, and unfortunately we could easily hear conversations in the next room. Also the people downstairs were disturbed by our moving around. For many people this may not be an issue, but at home we are used to a very quiet environment.
This would not stop us from returning, as the positives outweigh this negative, but we would need to have an upstairs room.