The location is the greatest thing: you can reach the center of Vienna by foot in 15min, and tram and metro are literarly in front of the building.
The appartment is micro small, you can't really open the one window that is there, nor lift the shades. The kettle was also out of order, and last evening and morning there was no hot water in the bathroom.
All in all, the appartment is quite enough to take the shower (if hot water runs), sleep over and go out and spend your day in Vienna. Therefore I would recommend it. If you plan to spend some time indoors, for work or something, you'll probably feel a bit squeezed.