Tha apartment is very well located, close to the metro, which we used to go to the Reed messe (around 20 minutes door to door), and close to very nice restaurants. Also, if you would like to sightseeing in the city center it is also close to the the main sights (e.g. Stephansdom) and Museumsquartier. Communicating with Constantin and his team was very easy and swift and he helped us out really quick when we managed to lock ourselves out of the apartment.
The apartment is very nice with big rooms and a fantastic terrace. Also, it contains everything you need in terms of appliances.