A very nice place, in the city center. Tidy and comfortable, with everything you need - complete with a baby bed, highchair and even a baby towel. Eva was very responsive, shared their favorite places and let us check in an hour earlier.
Can get hot in summer as many buildings in Vienna don't have the AC. Also, there are some steps when you enter the building and some heavy doors, which is not ideal if you have a baby stroller.