The flat is wonderful and stylish and not far from the city centre at all! It's a perfect place to spend your time in Vienna.
There are several supermarkets nearby. Underground, tram and bus stops are about 10min away. The flat is stocked with all the things you'll need - including an umbrella that came in handy for our stay there. :D
The hosts were fantastic and helpful, so I'd definitely recommend this flat for your vacation in Vienna! :)