This flat is in a great location from which to see all that Vienna has to offer. One can walk to the Schönbrunn Palace in about 10 minutes and the awesome facilities there can take at least a full day to enjoy. 10 minutes in the opposite direction and you can access the UBahn system and get anywhere.
The building does have a lift, which by European standards is pretty big. The flat itself is big enough to comfortably host a small family. There are two, double beds and also a small sofa that would be adequate for a child to sleep on.
Groceries are close by and there are plenty of restaurants (and an ice cream bar!) in the near vicinity.
It takes close to 10 minutes to walk to the parking structure, which costs 12 euro per day. We parked there and used public for the remainder of our visit, which I would recommend based on the competition for parking spaces in most of the areas that we visited.
Communication with the host was easy, fast and respectful. 24 hour check-in was also nice. If we get back to Vienna any time soon we will likely stay there again.