The apartment is in an interesting older building on a quiet side-street. It has an ivy-covered internal courtyard, high ceilings and large windows that open. The apartment is on the 4th floor, but there is a good elevator, so no problems. Everything was in good condition and worked - fridge, heating, water heater, appliances, etc, and the bathroom was renovated and spotless. I spent a week in Vienna in this apartment while attending a conference, and found it to be very comfortable. The location is convenient - the Wein Mitte train station is two blocks away, and there are loads of restaurants and food shops in the area.
I do usually prefer AirBNB's with self-checkin because of the difficulty of coordinating with the host, but in this case the host waited in a nearby apartment for me, (I was later than I planned, of course!) and it was very useful to have her show me how things worked, where the light switches were, etc. I recommend this apartment if you are looking for a quiet, comfortable place to stay in central Vienna.