My boyfriend and I stayed in Hannes' apartment for three nights. The apartment is situated centrally in the 2nd Bezirk, so it was very easy to get anywhere in Vienna by foot or U-Bahn. The flat is quite small, but very nicely decorated and the area is used well. The bed is wide and comfortable. There was a smell of tobacco smoke from the towels and blankets, but except from that the flat was very clean and tidy. I didn't get the chance to meet Hannes in person, but he responded quickly and friendly to all my messages. We got the keys form Hannes' friend David, who was super nice and very helpful.
I very much recommend a stay at Hannes' place! It was great!