The flat is really nice and cute, and it's really close to the city center. There are a lots of bars and restaurants nearby and due to the university campus close to the apartment the atmosphere is really young and fresh. It's also really easy to reach any district because of the connections with the public transports (i.e. you just need to take a bus from the central station).
We met Armine and he was really flexible and nice with us. We arrived with blablacar at 3am in Vienna and he waited for us for the check-in. He really saved us.
The communication was perfect and we didn't have any problem. I highly recommend this flat!