What can I say...the place itself is great - clean, prime location, spacious, well-equipped.
I have never had any trouble with Airbnbs before, but I did have issue with this host. The check-in instructions were basically 'call us when you're here', which I thought was a little strange. They didn't even provide an address, just the actual street name. The exchange was slow and ambiguous, and the time between our arrival in Vienna and our confirmation of the place being ready was extensive, with basically zero communication. When it was finally ready, we showed up, only to wait about 30 minutes for the host to eventually show up, rushed, and clearly unconcerned.
We requested a second set of keys upon our arrival. The response was 'yes, I will return in 40 minutes with a set of keys'. This promise was never fulfilled. I asked again, was told we'd get the keys the next day, still no keys. These are minor things but they add up and go to show how little care goes into the guests, which make sense given the number of units they manage.
If you're looking for a great place, but subpar host, this is the place for you. The reviews may be positively skewed, since they offer 5 star ratings in return for you giving them 5 start ratings.