Seven family members stayed during the hottest week in August! The host had helpfully supplied plenty of electric fans, and the apartment was aired with open windows and ready for our arrival - the fridge was on and cool. The kitchen is really well supplied with crockery etc. tea-towels, washing up liquid, bottle openers etc etc., plus plenty of toilet rolls, kitchen roll, bin bags.
Key box system worked well and communication with host very good.
Situation close to Westbahnhof station, Mariahilferstrasse and U-bahn stations, so ideal for our travels across Vienna.