The apartment is small but has a nice design and great location. Check in is a bit tricky - you have to get the keys from a box in another entrance of the building which is not entirely clear from the explanations we got. Upon check out, we were supposed to return the keys to the same place, but the code was not working :-(.
There was no kettle to boil water and no large body towels, only small face towels. We wrote to the owner and never received a response, even after three nights we spent there.
The dishes in the kitchen cupboard were filthy, which was absolutely disgusting. Some dishes had oil and pieces of food stuck on them. We also wrote that to the owner, but again, no response.
Other things that are worth mentioning: the wifi is not great; there's one small tall table for eating, but if you intend yo work there forget about it, because the chairs are very uncomfortable and will break your back; and climbing to the very-low-ceiling gallery in order to kneel to the mattress there might not suit everyone. It was ok for us, but we can easily think of many people who would find it very uncomfortable.
Bottom line, the location is great, the apartment is nice and could be much better with some more attention to the details. The filthy dishes were really disturbing. The communication was just inexistent, and that made our stay unpleasant, because clearly some of the issues could have been solved via communication.