This is a really lovely apartment near the center of Vienna, super convenient to the Secession, Kunstalle, Kunsthistoriches, Museumsquartier, many good restaurants, and the farmer's market. It's an easy walk from Karlsplatz, from which you can get anywhere (including the airport) via ubahn. If I had one worry about this apartment it is that it was on a busy street, but there was very little street noise on the 4th floor. There is an elevator.
And the shower water pressure / hot water is excellent.