The apartment is fully equipped, the best thing is to have two rooms to sleep and a dining room with table, sofa and tv to relax yourself at the end of the day.
The location is super: you can walk around the city center without using bus, tram or tube. But if you need, Stephanlatz is 2 minutes by walk.
Claus was very responsive, we managed to check in in the early afternoon when we arrive without any problem.
I surely suggest this apartment to stay to visit Wien.