The apartment is really nice and looks exactly like in the pictures. Is very well organised and the location is perfect: the street is quiet with a supermarket nearby, but it´s really close both to Mariahilferstraße going north (busy shopping street) and to the Wienzeile going south (the really nice and interesting market is at walking distance), so you have easy access to two different U-Lines. The area is really nice with lots of shops and restaurants.
We didn´t meet Roman directly, but we spoke with him several time at the phone and per messages. He was really welcoming and even provided us with a cot and a brand new highchair for our 9months old!
We were four adults and a baby and we were a bit squeezed, as you obviously loose space in the living room with the sofa bed open; but we knew that already when we booked. If that doesn´t bother you, then being four adults is fine, anyway I think the apartment gives its best with a couple.
We had a very pleasant stay and we would recommend it ^_^