Hannes was a fantastic host. He responded promptly before our visit and was very helpful with directions on how to get to the apartment. He met us at the apartment on time and answered all of our questions, gave us a map of the city and told us of places to visit.
The apartment is ideally located a short walking distance from the centre of Vienna and has everything you need for a comfortable stay.
It was a little dark in there sometimes as it didn't get much natural light through the windows but that was our only issue.