Denys is a very responsive host. If I had a question or needed a change, Denys was able to help.
The flat is very conveniently located near Prater and WU, clean, and good for a short stay.
My only comment is that it would have been good to know that the washer/dryer is pay-to-use in the building, which is fine, but would have been useful to know in advance of the booking. Otherwise, good experience.