I booked this apartment for my parents and they were very impressed and satisfied with their stay. They loved the apartment with its high ceiling and well appointed, comfortable interior. The owners really made the best out of the size of the 1 bedroom apartment. Moreover, it is close to everything you want to visit in Vienna and perfect to explore the city by foot (and don't forget that Vienna has more to offer than just the first district).
We did not meet Anna and Vladan in person, but they responded very quick to any question we had. It was very pleasant and easy to communicate with them.The cleaning lady gave us the keys (she does not speak any German, so you do not always get an introduction). Check in and out time was individually arranged and depends on occupancy.
Kitchen equipment was absolutely sufficient for a city trip, but could be improved for mid- to long-term stays.
Absolutely recommended for couples while sightseeing in Vienna!