I stayed from April 9 - 15, 2019
The location is marvellous, just across the street from a central subway, bus and tram station (Pratersten), from which you can go any where in Vienna within minutes.
A pretty safe neighbourhood even late at night.
Franz and his family are very freindly and cooperative.
The only downside of this place is that bathroom is not attached to the room : if you need to use the toilet you should go across the appartment to another room and to wash your hands or take a shower you should go for a third room...