We were nervous about our stay as we struggled to get in touch with our host via Airbnb, however Veselinka replied once we switched to text messaging.
The apartment is small but well equipped - we found the use of the washing machine especially useful, together with good cooking equipment and fan. It can be quite dark in the apartment, but we were out most of the time so this didn't really affect us.
The location is good, on a street full of apartment blocks and very near Belvedere Palace. You can walk into the centre of Vienna (around 25 mins) or take tram 71 from Rennweg. Tram 0, which goes from the nearest stop, goes to the Prater and you can also get from there to the Danube Island for swimming etc. A weekly ticket is around the cost of 4 return trips, so was well worth buying (thanks to Veselinka for that tip!). The Hauptbahnhof is also walking distance, so the location of this apartment is convenient if you are arriving by train.
We enjoyed our stay and would recommend this apartment to someone looking for a reasonably priced place in this area of Vienna.