Although we didn't meet Nenad in person, he has been in contact with us and has been concerned that we were fine, he is a great host.
The apartment has been perfect for 2 people and equipped with everything you need. The communication with the center is very good since the subway is 5-10 mins walking. The area is very quiet but you will find restaurants and supermarkets nearby.
We would definitely book again if we come back to Vienna.