Generally a nice apartment! The location is very central. The wifi works well. Despite being in a very busy area, I didn’t hear any noise at night.
Note that the elevator starts half a floor up from the lobby, and ends half a floor down from the apartment, so you will need to carry your luggage up some stars. But it’s not much of an issue!
There aren’t outward-facing windows. Instead there are upward-facing skylights. You can see this in the pictures. It didn’t bother me!
Note that there are two single beds that can be arranged as a larger bed for one person, but the sheets are all for each individual bed, and there’s a small gap between the two beds. So it’s a bit awkward to try to sleep in the center if you’re just one person.
The washer-dryer was kind of complicated to use, and the drying function seems to be slow/not very powerful. But I’ve heard that’s common in European washer/dryers.
Note that there’s a 30 Euro cash fee if you want to check in after 21:00.