This apartment is amazing. It is much better than the picture can express. You fell like you sleep in the queen's apartment. It was superclean, it is really good equipped, has an enourmous bathroom with a bath tube and a walk in shower with radio, a large badroom, cosy living room with tv and in case it is needed, another mattress. We found a parking place right down the building, which was free over night. It is 15 min ride to Rathausplatz and around 35 min walking to Stephanplatz.
I really like the self check in system, very conveninet. By far, this is the best place i have stayed so far in Vienna and i totally recommend you booking it!