My friend and I stayed at Dan’s place for 3 nights, and had a perfectly pleasant stay and the location was good too. Our main issue (which can’t be helped but we thought was important to mention for those looking for a peaceful stay) was that the bedroom windows backed out onto a courtyard which was absolutely teeming with pigeons. They were incredibly noisy throughout all hours of the night, which is tricky as you want the window open (otherwise it’s too hot) but they kept flying close to our bedroom and making a racket. Not sure what can be done about that, but just a warning for future guests. Apart from that, we had a good stay - as I said, it’s pretty basic but all you really need for a cheap and cheerful stay in Vienna!