We stayed in this flat for a week (2 adults and 4 children). It's a very nicely furbished flat, spacious and cosy. It has a fully equipped kitchen which enabled us to cook most of our meals. The main virtue of this flat is it's location. City centre, including many tourist attractions like Hofburg, Stephansdom, even Museumsquartier or KunstHausWien are in walking distance. Metro station "Schwedenplatz" connects directly with Schönbrunn and is around the corner. There are many groceries nearby, like "Spar" or "Billa", also a Starbucks and McDonalds.
We enjoyed our holiday in this apartment and recommend it.