For my family of four with two children we found this apartment good value and a reasonably convenient base to explore Vienna and surrounds.
The online presentation of the apartment matched with our expectations quite well and the easy access from outside the building (which was an important factor) was a relief with the voluminous luggage we had in tow.
Inside, the apartment was mostly spacious and comfortable, especially the bedrooms. The dining area was fine for our needs, the kitchen and lounge area a little on the small side, but manageable. The bathroom was clean but with a couple of items requiring some maintenance.
Overall this apartment was as described and a good value option as a base for exploring other areas of Vienna.