The self-check-in/out was easy and smooth, just as the communication. Josef let us check in a bit earlier.
The apartment has plenty of room and was clean and comfortable. WiFi was working perfectly and the kitchen was equipped with all the needed basics including tea, sugar, etc. The toilet is quite small but separate. There's a small balcony with tables and a rooftop view.
The neighborhood is quiet and the location is excellent for those with a car or willing to use public transportation. The U-bahn is just 7-10 minutes away from the apartment and is super convenient in Vienna. A nice and cheap Lidl is also nearby. Beautiful Schönbrunn is just within a walking distance away.
The apartment needs minor repairs here and there, such as paint renewal (we fixed one of the kitchen cabinet doors ourselves).
All in all, I would commend this apartment.