The flat is very comfortable, with lots of space, simple but with tasty and fine details, provided with all you need for cooking and cleaning. It was bright but really silent as well, thanks to the window frames and the blinds.
The locations is very convenient, as if there is a red line metro stop just in front of the door entrance (4 stops to Stephansdom, so it is not far from the city centre), so that you can visit Vienna very easily. The area is pedestrian. It is not an elegant zone, you can find sometimes homeless people and beggars, but it is pretty safe (families stroll in the street at every time) and plenty of shops (supermarkets, H&M, Mc Donald's, bakeries, kebab and pizza take-away, clothes and shoes shops...).
Viktor was a perfect host, kind and helpful, he responded immediately when we needed some info or some help. We were allowed to stay in the flat till the afternoon without any other costs, because we had the flight in the evening.
We surely recommend this flat!