Kateryna's apartment is located right beside a metro which is accessible to the city center.(there happens to be a nice little Uber sign that helps you identify the apartment.) We met with her along with her brother and she shared tips on travelling in Vienna as well as the nearby eateries.
The apartment is more spacious than it looks in the photo and definitely feels cosy and comfortable to stay in. Due to the location and the size of the water heater, bathing space could be a little cramp for bigger size individuals.