The location of Kiki's apartment is excellent. It is in a very calm residential area at 15 minutes' walk from the city center. It's also only at 12 minutes' walk from the Central Railway Station (Hauptbanhoff Wien) which is connected to the Vienna International Airport by fast train (18 min ride only). The studio apartment itself is large and bright, well-equipped with everything you need.
It is at the 4th floor without escalator or lift. So if you have a heavy and big baggage, it is good chance for exercising your body. I always communicated with Kiki by email and there was no problem. When I was there the old washing machine was broken and the new machine didn't arrive yet. So I had to do the washing by hand. Otherwise everything is excellent. There are a lot of cafes, bakery, shops and supermarkets of different sizes along the main street leading to the Opera House. Everything is very convenient. Highly recommendable.