My friend and I had a lovely stay in Roman's apartment. It was warm, comfortable, and clean, with all the facilities that we needed. The bed was very comfortable, the kitchen easy to use, the bathrooms really lovely, and overall it is a very spacious apartment.
The location is good for access to Schloss Schonbrunn and Belvedere as well as the Naschmarkt, but a bus has to be taken into the city, as it takes a bit longer to walk to the train station. It is very close to a number of supermarkets and other convenient stores.
Overall, I would very much recommend staying here.