All in all a very good accomodation!
As a visitor for a few days in Vienna, I really enjoyed staying at this accomodation with my girlfriend. The huge advantage is the location. It seems that within almsot 20-30 mins you can be everywhere in Vienna using the metro, or at least in the "worth-visiting" spots.
I put 4 stars instead of 5, due to some details which personally I feel that need to be improved. Practical stuff that could make the experience in this accomodation even better.