We enjoyed our stay at Adrien's place. Communication with the host was easy. Apartment is as described in the listing, although we found sleeping on the mezzanine not too practical (our 6-year-old loved it though). Apartment is quite small, but really clean and with all necessarily amenities (we only found that there were not enough bed linens for the sofa bed so had to use duvet without duvet cover). Everything else was great.
Location is really convenient, very close to subway station which makes getting around Vienna really easy, and close to Spar supermarket.