I had a pleasant stay at Dominik's place. First of all, its very easy to communicate with him, very responsive. His place is also near the city centre and very accessible, near train and tram station. It also near restaurants and supermarket.
Just a note though, there is no elevator. so keep that in mind if you plan to bring big and heavy luggages.
Overall, its a good experience, will definitely stay here again when I go back to Vienna.