If I ever get back to Vienna most probably this will be my apartment of choice again. It's spotless clean. It's a beautiful classic building, yet the apartment is newly renovated, so all modern equipment is there. The owner is polite, friendly and helpful. AC was very pleasant when outside temperatures rises to a 35 degrees. And the location is very central, yet quiet and tranquil. And the flexibility in check in and check out was perfect for me.
Totally recommend it.