Marina and Andrei were very friendly! We arrived very early and left very early in the morning as well - thanks to the host we could make an early check in and a self check out, which were were comfortable for us. The flat is located very well, the metro is in the nearby. One can find all necessities: the iron, tea, sugar and even a coffee machine.
I would highly recommend to visit a Kebab place next to the U3 station - there are very friendly workers!
Marina and Andrei also helped us by giving a list of place to eat in Vienna. We enjoyed our stay!