I had a great stay in Christian's place with Markus as a very friendly host. The apartment is bright, nice and stylish with plenty of books. The location is perfect in a colorful area with both pawnbrokers, kebab stalls and fancy cafes and very close to the Donau - I went swimming in the Neue Donau almost daily - yet close to the Prater and not too far from the center either.
I enjoyed a good mix of privacy and casual chats with Markus. Would definitely consider again, if once again on my own in Vienna.