Great deal for the money. If you're looking solely for a base camp from which to explore Vienna, this place is perfect: located about 5-10 minutes walk from Naschmarkt, and about 15 from Museum Quarter and 20 from the rest of old town. Margaretenstrasse is a block away.
Aside from location, the room is totally clean. Might be cramped for 2, but doable if your'e not spending any time there other than sleeping. You will have a private shower and sink, but share the toilet with guests staying in other rooms.
My only issue was with weak WiFi -- Michael was responsive to help connect me when I could not, but the signal was very weak in my room (it was much stronger in common areas, and even the stairs of the apartment building).