Kiki's place is a great place to stay in Vienna. It is a 2 minute walk from the apartment to the U1, which takes you directly into the center of the old town. The self check-in was extremely easy, and the apartment was large and perfectly clean. Just remember to go up the LEFT staircase after you get the key from the lockbox, as we went all the way up the right side before we realized we were on the wrong side! I would definitely recommend Kiki's place for anyone travelling to Vienna :).