We booked just 24 hours before. Nadia responded quickly, gave us all instructions needed to find and enter the house. We found a nice and comfortable studio with high ceiling in close proximity to U6 and tramway 2 , the last one takes you directly to the ring as to Karlsplatz, Volksteater ect. The house is popular so the check in and check out time need to be respected, but we were lucky that we could enter and leave baggage 2 hours before official check out at 4 pm ( a bit late, I think ?). The shower was great, my 5-year old enyojed it a lot. We have not explored surroundings but there is a central heating station close by -the style of Hundertwasser house, interesting to see, Billa is around the corner and a restaurant with fast food close by. Overall Vienna was great and the studio was really nice.