Probably the best value-for-money you're going to get in Vienna! Especially if you're coming by car as it has free parking (which is surprising given it's location). It's in a residential area, only a few minutes walking from a subway station, so once you've parked your car you won't really need it anymore. To actually park the car though is a bit of a challenge as the entrance to their parking lot is incredibly narrow and I imagine with some cars (large SUVs etc.) you'd probably not be able to get in at all. Though the opening hours of reception are limited, staff is very friendly and helpful. Rooms are large and comfortable with a very homely feel to them, with free WiFi throughout.
If you're looking for a hotel where you'll be able to get pampered at all hours of the day and have all your typical hotel amenities this is probably not for you, but if you just want a comfortable place to stay and will be spending most of your day roaming the city instead of staying indoors, this is a fantastic place.