Michael's apartment was great for us because it was in a great area - a walking distance to the city center and many must-see places in Vienna. The metro and buses were also close, so no problem getting anywhere including the airport and central train station. An added bonus was the famous Naschmarkt - a great place to shop and dine.
The apartment was clean and had all the necessary amenities, and even though we were staying in Vienna in August with temperatures as high as 33*, it was cool at night. Great WiFi connection I should add. We would stay there again.