Andrija's apartment is a quality, affordable and well-located place from which to explore Vienna. It is close to excellent Viennese public transport, although I walked from the apartment to the city centre every day without any problem - the central areas are close by, and the route seemed very safe, even at night. Even the museum quarter (on the other side of the central area) are definitely reachable by foot. The neighborhood, while not in the fanciest part of town (a good thing in my opinion), is quaint and relaxed. On the street outside there are a few little gardens and parks where parents bring their kids to play, so it has a homely feel about it.
The apartment itself is very well appointed, quiet and very clean. I enjoyed staying there and have no complaints at all.
Andrija is very accommodating and willing to help. I arrived earlier than expected, well before checkin, and he was kind and welcoming.
I would recommend Andrija's place to anyone (especially young people) wishing to see the beautiful city of Vienna.