I had a great stay in Vienna, Ralf was very accommodating to all my requests and his housekeeper is also very helpful. The apartment is about 10 to 15 minutes away from the city centre. While you enjoy the hustle and bustle of a city you can escape to the nice quiet neighbourhood to rest for the night. It is also easily accessible by the tram line and also within in walking distance. I would definitely return again and if there is availability will be happy to use Ralf's apartment again.