Nice apartment which is well equipped (oven, dishwasher, wash machine, WiFi etc.) and with a good location - 5 minutes walk to Westbahnhof station. This station has a supermarket, as well ofcourse connectivity via tram/metro to all of Vienna.
Peter met us and showed us the apartment, as well as helped point out things to see and places to go eat. There is an elevator in the building (3rd floor apartment) which is quite small (2 at a time) but no problem for us.
One thing to keep in mind - the bathroom has a curtain only and no door, again not a problem for us, but something to be aware of.
We were 4 adults and overall had a comfortable stay. Thanks Peter and Catherine !