The location of the apartment in the city center was very nice and good for visiting all the important places. The apartment was clean and had nice furniture of good quality. As stated in other comments before, it was rather loud inside. In general the place was a bit small, not from the size of the rooms but especially from the height of the ceilings. Also I had to lower my head to walk through the doors (with 1,82 m I am not particularly tall). The missing door to the bathroom (only a folding door), was a bit inconvenient when using the toilet. Check-In at 3 was rather late, when you want to use also the day of your arrival without running around with your luggage.
Overall impression was Okay for a short stay though.