I didn't meet Roman but the communication with him was excellent. He responds quickly and re-arranged my check-in according to my schedule which I had to change at the last minute. He also was very kind to refund me one night upon giving him notice that I would check-out one day earlier. The apartment is well located, close to grocery store, U-Bahn and walking distance to the city centre. There is a good Illy Espresso machine in the apartment and a dishwasher. I would stay there again if I go back to Vienna.