Kathrin and Ronny were wonderful hosts. They promptly responded to all of our inquiries and were flexible with our late arrival. The apartment is very clean, spacious and well decorated. There were many personal touches (CD collection, books, chocolates, wine...) that made the apartment feel just like home. It is about a 25 minute walk to the tourist attractions but there is a tram stop nearby. I would definitely recommend staying here when in Vienna!