Our family (my wife, and 3 kids aged 16, 15, and 8) stayed here in early July and it was everything I hoped for. It’s a roomy and charming old style building with 14 foot ceilings and lots of windows. It was only one flight of stairs up as well. It’s on a side street and very quiet. We slept with the windows open as it was a hitting 82 degrees during the day and it was the perfect temp to sleep in.
The flat is exactly 2 tram stops to the museum quartier and the old quarter straight down one street so super easy to get to. The subway stop is a 4 minute walk away (I timed it) allowing you to get to the rest of the city very easily. We bought the week long tickets that allow you to use all public transport (subway, trams, and buses) as that was the same price as the 72 hour ticket. Having said that, we were never asked for our tickets once and they really don’t check.
We liked being close, but not in the tourist section as it gave us a flavor for the local Vienna. Coffee shops abound and there is a Tapas bar around the corner with Great fare as well as an Indian restaurant we enjoyed. Italian and the Weimar Cafe are both around the other corner. The Bila (small grocery) is 1 block away and there is a local pub 2 blocks away. We were there during the World Cup and so watched one game at the Steigl brewery 2 tram stops away at the University and the other at the WUK, an old building housing several bars and clubs and a courtyard. They also have live music on the weekends and that was 3 blocks away.
The only downside was the shower is small and could use an upgrade. The other shower is a tub with a hand held shower head that could use a shower curtain but we managed just fine. We liked that there was milk and juice in the fridge for us upon arrival and Christian provides coffee and basic spices. We loved it and would recommend it to all.