The apartment is well located, on a quiet street and it's also easy and fast to get to the center (it's not in the center). System makes check-in easy. The place itself is equipped with basic furniture but beds are comfy, unlike pillows which really need to be replaced for better ones since those were really uncomfortable. Overall, I recommend as long as the host provides better pillows, the place will serve as a good location for rest in Vienna.
BTW, we haven't met the host in person, communication was ok but I wouldn't rate as super host.