I had a great time at Franz's place and would recommend it. The flat was spotless, the bed was comfortable and the room was quiet - I had a great night's sleep. There's plenty of storage and a nice big mirror to do your make up.
It's in a great part of Vienna - there are lots of shops, cafes, bakeries and supermarkets a few minutes walk away. Transport links are excellent and it was quick and easy to get to the places I wanted to visit.