Overall this place met all expectations.
The location was a little out of the way from the major attractions of Vienna (you have to take two metros to get to most places). However the place is 3mins from a metro stop and is very easy to reach if you're coming from the Westbanhof. In general the area is not the most tourist friendly given the proximity of the hospital.
The studio was very clean and was a great use of space. It would be a VERY cosy place if four people were to stay and the auxiliary sofa is not comfortable.
Regina was quick to respond to my messages and was very easy to deal with.