Stefan's place is a cozy, comfortable, and clean apartment in a convenient location -- within walking distance to the Ringstrasse, but still in a quiet Vienna neighborhood. Even though Stefan was out of the country on business during my stay, he was an attentive host - sending a friend over on my arrival to ensure everything was fine, answering questions promptly through the airbnb website, and finding transportation to the airport at the conclusion of my stay.
He provided maps (neighborhood and city) and brochures for many Vienna attractions and deals. I was especially pleased with the Vienna Pass, and purchased a six-day pass with unlimited rides on the Hop On Hop Off buses plus admission to more than 60 top attractions -- saved over 100 euros on the places I visited than I would have if I had purchased them separately.
I would highly recommend Stefan's apartment to other visitors to Vienna. The apartment itself and Stefan's help contributed to a marvelous week in Vienna for this somewhat inexperienced traveler.