Me and my wife had 3 very nice days in Vienna. We used the apartment only for sleeping and taking showers as we spent most of the time visiting. Still, we liked the apartment as the room was spacious, the bed was confortable, everything was clean and it was a very quiet place. There is a small kitchen which we used at minimum, but it looked to have everything you need.
It was very convenient for us that there was a free parking place. Maybe for bigger cars it's not so easy the enter the gate. Also the location was good for us: 20 minutes walk to St. Stephan's Cathedral or 5-10 minutes to subway.
We appreciated also that it was easy to find the location, the host was flexible regarding check-in and check-out. The communication with the host was very good.
I would pick it again next time I will go to Vienna. I totally recommend it.