Dada, Zoe, and Peter's place was in a really ideal location. Conveniently just a single stop from the Wien hauptbanhof. A block from the Taubstummengasse U1 Metro stop (which gets you into the center in minutes) , two blocks from the trolley and bus lines on Margaretenstraße, and walking distance to lots of shops, restaurants and the Nachtmarkt.
Check-in was an absolute breeze and getting into and out of the flat could not be easier.
The flat itself is perfect for a long term stay with a well apportioned kitchen, very comfortable, and lots of space to stretch out. It's also across the street from a SPAR so you can grab water, sandwiches, beer, whatever you need.
It's also not directly in the touristy areas, which I prefer, because it tends to be a little quieter, and you get more of a sense of place. You are surrounded by local restaurants and wine bars.
I really recommend this flat.