This is a unique property - located within a hotel. The location is great from an airport transfer standpoint and also for public transit purposes.
It is also close to Stadtpark (very nice on a summer evening), Ringstrasse, and a 20 min walk to the Opera House.
As others have noted, there is no possibility of preparing your own meals and the provided refrigerator is quite compact.
It was VERY clean and well-kept. We were not able to figure out the cooling system and some simple room fans would be a great addition for future guests.
All in all, perfect budget lodgings in Vienna for this family of five.