Sophie's apartment would be a perfect launch pad for a longer stay in Vienna for a couple or even a family of 3. It is located 5 minutes walk away from the old train station (Before Sunrise!) as well as the U3, U6 underground trains or No 18 or 6 trams. Coming from the Hbf or going to the city was very easy. And it is in a safe and quiet neighborhood with essy access to Hofer the supermarket for local groceries. And you can put your luggage in the storage locker in the train station and spend some more time in Vienna if you have a late departure.
The inside of the apartment was bright and modern with comfortable sheets and towers. I mostly used the nice dinning table for teleconferences. The kitchen was very well stocked with consideration given to small details to make one feel at home. The thermostat in the living room worked as well when the temperature dropped.
All in all, highly recommended and I hope to get a chance to visit and stay here again!