We had a great stay in Isabelle's flat. The apartment is absolutely gorgeous, clean and big enough for two with a nicely thought-out design, a fully equipped kitchen (from pots and pans over a full set of cutlery to plastic containers, all is there), a comfy bed and luxurious bathroom with a big shower. Isabelle sadly enough wasn't able to welcome us personally but went out of her way to communicate all details to us both via online messages and letters upon arrival, as well as a small bottle of wine, some chips and some tips on Vienna, a nice and welcoming gesture.
The apartment is well located on the ring road, with a supermarket around the corner and the city center close by with a tram station in front of the apartment.
All in all, an apartment to be recommended, would stay here again.