Petra's place is a great one for visiting Vienna. Although the V bezirk is not really the city center, the very good public transportation makes the whole Vienna at an easy reach. An U4 metro station is just a 5 minute walk, and trams 6 and 18 as well as the bus 59a take you quickly wherever you want.
Petra is a nice host, ready to provide you with any information you might need, in order to make your stay pleasant. The amenities in the apartment are basic but useful. A note for people who like cooking themselves: for you the lack of a stove might be a downside. But for all other light cooking the kitchen, although small, is adequate. The bathroom is very small, but what I heard from some local people that is often the case in most Viennese apartments.