Birgit is a great host, she answers immediately all the quesstions (even the silly ones ;) and gives a lot of wonderful tips and advices. She also adapted to our check-out time and left us to leave later. The apartment is very comfortable, not very centric (1 metro stop from Prater amusement park) but very well connected with the center, the metro is 1 minute walking. The bed is very big and comfortable and the flat has everything you need for cooking. The windows overlook a busy street but they are very hermetic so you don't hear almost anything. If we come back to Vienna, we would love to stay at Birgit's apartment again :)