We stood there for a week, everything was there, clean and the place is indeed perfect for two.
The subway station is quite near (5-10min) and many supermarkets are available nearby. Thus, well located and in a very calm neighborhood because not in Wien’s center itself.
We never saw Clara but the arrival/departure indications were very clear and she was always available to help us!
I highly recommend this place to stay for a couple of days or even more !