I spent some very wonderful days at Steffi & Ben's apartment. It was situated in the center of Vienna, the Metro and Underground-stations about 3 mins by foot away. I really enjoyed being in such a convenient spot for traffic. :)
The apartment itself is great, cozy and neat, furnished and decorated with great love and even with little tips where you can spend your time in the city.
Definitely would recommend staying here and would love to come again. :)