Almost perfect place to stay. Good price, big and clean room, private refrigerator and kitchen, kind workers, fantastic water pressure of shower, exotic room setup. The places around the hotel is kinda boring but it is close to transporting systems so it is not a problem.
The only thing missing was air conditioner. Also, some rooms are close to railroad. The building's soundproof system was reasonable so it was not a problem for me if I close the window, but because it doesn't have air-conditioner, I had to open window. However, as far as I know, the temperature of Vienna is not that hot in average summer, so I guess it would be not a problem if one visit here in usual.