Katerina's apt is in a great neighborhood--close to groceries, cafes, and a public park (Augarten), and near enough to the Inner Town where all the museums are located plus close to a streetcar (strassenbahn) stop if you want to save a few minutes of walking. It's a very quiet area of town, but the apt is located on the ground floor so you do get a bit of pedestrian/vehicular noise from the outside during most hours of the day (it's only problematic since one wants to open windows to cool the apt off during the summer, but otherwise we had no issues with noise).