My girlfriend and myself had a wonderful 3-night stay in Siu's apartment...had the huge room with huge comfortable sofas, dining chairs and table, plants, books, numerous shelves, a big-enough bed (as well as an exercise ball :P ) and much more all to ourselves. Siu and her co-host were always available for any queries we had and even accommodated our super-early check-in time request. The entire apartment was extremely clean and well organized. We would love to be back here when we visit Vienna again.