Apartment is in a good area and within easy walking distance (10-15 mins) of all the major sights. We didn’t use the underground at all though there is a station within 100 yards of the apartment. Apartment is a good size, comfortable and warm, with a well equipped kitchen, not that we used it much as tended to eat out. There are bars and restaurants literally on the doorstep. Even though we were close to a couple of bars eg Bestens, we had no issue with rowdy revellers or late night noise. One of the things we did was go on a bike tour with Pedal Power - it was excellent and well worth the money. As we were in Vienna out of season for bike tours, we were lucky 3 other people had asked about a tour on the same date as us so we could split the cost of our tour guide, Marco- who was absolutely brilliant!
Eva had suggested using Vienna Airport Cab as an option to travel from the airport to the apartment. I can definitely recommend this company - very efficient and cost 27€.