The apartment is very spacious with big and clean rooms, a very comfortable bed.
Perfect if you like to take a bath (but not very easy to take a shower without sprinkling water in the bathroom).
The underground is very close to the Airbnb, just at the corner of a commercial street, viennese café down the street and also a super bio & unpacked market.
The underground line U3 is very convenient, easy to reach the very center of the city with museums, opera etc...
We didn't have the pleasure to meet Hans, but it was easy to communicate by message.
A friend welcomed us and was a pity that she doesn't speak english, only german that we don't understand. She was very in a hurry check in done in 5 minutes but Hans explained us by message that her child was sick.
We anyway had a very pleasant journey in Vienna.