Fabulous location, check-in complicated, but a clearly described treasure-hunt, so a bit of fun to get the evening started :-)
The room is basic, but fine for a night or two, since everything you need is at your doorstep. You'd need to ask the host for WiFi and kitchen, it's not obvious.
Everything was very clean. The walls may be thin, as someone commented, but if the other guest is considerate you should have a pleasant stay in the center of the city.