This was a perfect little self-contained home-from-home studio apartment. I bought a 24 hrs train ticket but it's not needed as the CAT station is about 7 to 10 mins walk, and the centre of Vienna Stephansplatz took me only 15 minutes (slow walk because of so much to see). Internet was good so I could also do a day's work. There's no need to bring any guide book, there are numerous fantastic guide books on the bookshelf. It was real quiet because it faces on the inner courtyard and, full of light as it's on the top 5th floor (there is a lift). I'd love to stay there again. Nina was a super host, providing lots of tips and ideas for places to see and where to eat out (I did not eat out but next time I will). Travel using the CAT train from the airport was a breeze both ways (16 mins direct), and returning I could (with a CAT ticket) check my baggage in at the CAT centre in the city before taking the train to the airport.