I absolutely loved staying at Katrin's place. The apartment is located on the top floor of a quiet building. The elevator was very handy for heavy suitcases and end-of-day tiredness. The apartment itself was impeccably clean and well-appointed: very soft and large bed and a decent sofa bed, reliable air conditioning (it was extremely warm in Vienna during my stay), strong wifi, a well-stocked kitchen, and a very handy washer-dryer. The apartment is very conveniently located—there are major public transportation lines right outside the door, it was so quick and easy to get everywhere I needed to go. There's also a very well-stocked grocery store right across the streets and lots of food stands and restaurants around. I would absolutely stay here again during my next trip to Vienna, and would recommend Katrin's place to anyone.