We (a family of 3) have stayed for 3 months at this place.
The instructions were super clear and it was easy to find. The apartment was sparkling clean. It had all the amenities (with clear instructions available) and toiletries. There was also a separate table in the living room - convenient if you need to work from home.
The place is quiet and is very nicely located: within 3 min walk there are 3 grocery shops (one of them works on Sundays which is pretty rare in Vienna), a pharmacy, and a toiletry & personal care store. Also, it's pretty close to the center: within walking distance from Schonbrunn and 3 blocks away from a tram station.
Josef was a very hospitable host and responded very quickly: we asked for an extra set of bedsheets and got it within an hour.