The apartment is spacious and very well appointed with nice quality feel in a quiet area but not far from the city centre. Hans, the owner's father was very helpful and even met us at the metro station which is very close and convenient. As a couple we found the apartment extremely comfortable but it would be just as pleasant with one or two more guests sharing/making use of the sofa bed.
There is a small supermarket nearby as well as a 'corner shop' just across the road. The metro station has frequent trains to the centre which is only four stops away and there's a good link to the airport trains.
We have no hesitation in recommending the apartment - a great place to stay for exploring fascinating Vienna.