I spent 1 week in Claudia's apartment and everything was just perfect! Claudia was very fast in answering to all my questions before my arrival and during my stay in Vienna, and her indications were always very precise and detailed.
The apartment is a lovely nest in a nice quartier of Vienna, from where it is easy to reach the city centre: by public transport it takes 10-15 minutes while by foot not more than 30 minutes. The apartment is full-equipped, and fourinshed with style. The "plus" was the balcony prominent to the internal part of the building, a quite place where I could enjoy my breakfasts in the morning (I was lucky: during my stay Vienna was so sunny and mild!).
Last but not least, the cleaning: exemplary!!! Very hard to find a similar neatness also in a 5 stars hotel...
Stated that, I think that it is useless to add that I strongly reccomand Claudia's apartment :D