This is a fantastic place for its value! You are in a walking distance to all museums and opera. On the other hand there are no crowded tourist spots or pubs nearby, so it's very quiet in there. The apartment definitely has a lively atmosphere, highly recommended if you are looking for true Airbnb experience.
Chris responded very quickly to our requests. He's a kind and positive guy, it was very nice to meet him in person :)
Two things you may consider as downsides:
1) the toilet room is quite small. It was not a problem for us, but could be an issue for a heavily built person
2) wall sockets are inconveniently located.