Fárshad was a very nice host, he was very responsive before our arrival and very friendly and helpfull during our stay.
As for the apartment - the localization was very good for us - close to the metro station and Prater park; we've been given the keys to the whole facility (building and our room) so we didn't have to worry about when to go out/come back. The Wi-Fi was provided and it was working without any problems.
The room was enough for two people, there's a big closet you can use (although partially ocupied by some stuff), a big comfortable bed with sheets etc. and a desk (with Vienna's attractions map, which was very helpfull :)).
The only thing that wasn't perfect was the cleanliness of the common parts (kitchen/bathroom) which was quite disturbing but other than that the stay was good.