This hotel is perfect for a (short) stay in Vienna. Near to all forms of transportation, so getting to the city centre is no problem. Very quiet neighbourhood despite being opposite a theatre. The hotel currently has no restaurant (as under renovation), but this was not a problem for us as we wanted to eat out anyway.
I would not say the room was comfortable - it has been designed from a "minimalist" perspective, which although interesting design-wise, gave a rather stark appearance. E.g. wooden floor, cupboards not easy to open. Bed was ok and once we sorted the room temperature out, slept reasonably well.
Bathroom - very odd design. There was a shelf across the entire wall space from the bath, across the sink and loo. Because it was over the sink, you had to be careful not to bash your head when brushing your teeth! And the shower was on the side of the bath, not the end - so felt a bit cramped.