I arrived in the evening. Communication for check-in was very good, I could call/write over Whatsapp and the host wrote back within minutes.
Since the apartment is so central, you cant park the car there. The host didn't hesitate a minute, climbed in our car and showed us a perfect parking spot, where I could leave the car over the weekend. In addition he rode back by subway with us and showed us everything in the appartment.
The kitchen is very clean and spacy, as is the bathroom. No black spot on the silicon, everything shiny. The room itself has very high ceilings and a huge window, very bright. Sofa, table (with a lot of guides and maps for Prague) and a single-bed are on the lower floor. The double-bed is placed on a sort of deck on a higher ground. Because the deck is a made of wood, it can be creaky, but personally it wasn't a problem.
All in all it was an awesome stay: The location of the apartment is very good and the host is very friendly. I can recommend it.