First I was alone in the flat during my 1 week stay, so I didn't meet Florian. But my communication with him by email was excellent. Florian explained me very well how to reach his flat from the airport and to get the key. By the way, Thank you Florian, because the bus shuttle from airport to Vienna Center is a very good tip ! It's fast (less that 30 minutes), comfortable and very convenient ! Single ticket is 8€ but only 13€ for a round trip ticket and the return ticket is available during 1 month.
About the flat : you get exactly what you see on the pictures. Also when I arrive, the flat was bright and clean! It's big, extremely quite, well located, in a nice area of Vienna. It's on the ground floor !! No stair to climb. I could use the big kitchen. The bathroom is very good. My room was big, very quite. The bed is comfy. I have no negative comments regarding my stay. I can recommend to stay there if you come to Vienna ! Thank you again Florian !