My kids (older - ages 22 & 13) and I really enjoyed the apartment. It was easy to find, and Sabine & Chris gave up-to-date information regarding some transit closures and alternate routes that were going on during our stay. The place was clean, stylish, and hospitable. There was a printed manual with not only instructions on the amenities and rules of the apartment, but of things to do and places to go and eat in Vienna. Check-in was done by using a lockbox which had the door keys, and Chris and Sabine provided pictures of the front of the building and location of the lockbox and front door, which helped greatly. There is a grocery store right across the street (closed on Sunday - which is standard for Vienna), and the kitchen was fully stocked with cooking utensils, pots & pans, cutlery, etc.
Would highly recommend staying here.