The apartment is simply furnished, has everything you need (including really good WiFi) and is perfectly located next to the Pilgramgasse U-bahn. The other tenants were incredibly quiet, but be aware that the bedroom faces the street, so you hear traffic in the morning.
Derwin, the co-host, was very friendly and quick to respond when I had a problem with the water heater and another time when I needed a spare set of keys for my friend who was visiting.
I stayed for a month while studying in Vienna and was happy with the apartment and felt it was very good value for the money.