The apartment is in the center of Vienna, and the location couldn't be better.
However, I have two comments:
1) We arrived on a Saturday evening, all supermarkets were closed of course, and we were appalled to find that the apartment didn't have any cleaning products! No hand soap, no shower gel, absolutely nothing! I have been to many Airbnb apartments and they all have the courtesy to include these kinds of amenities for the comfort of their guests. As mentioned before, the situation was made worse by the fact that supermarkets were closed on Sunday morning so we couldn't buy any.
I wrote the host, and he sent us 1 Lidel hand soap packet to the apartment on Sunday, still, if I pay around 100 Euros per night in my stay, I expect these things to be in the apartment.
2) The heating system in the apartment was not working at all. Vienna is not a particularly warm city, and the fact that the heating system was not working was very uncomfortable for my girlfriend.