I spent 4 nights in Hotel Kugel and it was very good..staff were friendly and the couple who run it were very helpful with advice on getting around Vienna, where to eat locally, organising cabs to the airport and packing tricky items for return flights. The room was good, clean with comfortable bed, windows that open, with life outside. Breakfast seems to be largely organic and catered for most tastes. I was on the third floor and the room was quiet enough especially in such a central location. It felt very comfortable and safe so fine for travelling solo, and easy to walk to galleries, museums, music venues, theatres and other tourist spots.