Company bought and rents out or subrents the whole building.
They even have an office in there. It's basically a hotel with key-boxes anstead of an 24h-reception.
Room is beautiful, because it's an old building, but a bit soulless. Internet connection was extremely unstably, it constantly was ging on and off.
The room was quite warm but that got better after an technitian fixes the heating which was saying 29 degrees and couldn't been adjusted.
Okay, but not what many other real airbnb- apartements I've been can offer..