Three of us booked the apartment based on the description and, by and large, were fully satisfied with the apartment where we ended up. The location is easy walking distance to trams and trains, as well as very close to a variety of shops for groceries and other items. It is also very convenient to reach many of Vienna's tourist attractions. (That said, the meeting place for the host is NOT the building where you are likely to end up staying. If you go inside at THAT address, it is far more sketchy-looking.)
As for the apartment itself, the kitchen is supplied with basic equipment for cooking, and towels and bedding are also supplied (although not toilet paper or laundry cleaning materials). The rooms are very large with high ceilings. The building also has a lift, which is great if you have large bags.
There were several small niggles about our visit that I feel should be flagged. First, our host found it difficult to believe that three women would be travelling together if they were not in a relationship and had not made up all of the beds. In addition, although the apartment was advertised as having 1.5 bedrooms, it is apparently their policy not to open the separate toilet unless four people are staying together. Once those matters were sorted out, however, we had no issues.