Hi Martin,
We had a good night sleep but would like to point out that the pictures do not really reflect reality. Furniture is old, a bit "cheap" and some of it is really showing its age.
Also, very important - we were missing half the bedding - only had one pillow and a 1 person blanket
Would be very good to advise all guests coming by car that parking in Vienna is a big pain!! most of the parking lots around are very expensive but there is a "Park and Ride" parking lot to the ease - 2 metro stations down.
Very good positioning but that's about it.