Our guide seemed very knowledgeable and spoke acceptable English. By driving out to the Danube Tower, we were able to see a lot of Vienna outside the downtown area where most tours are concentrated. The view from the tower is great. I was concerned that the last stop with the complementary glass of Viennese wine wasn't going to give us enough time to enjoy it, and get a bite to eat, but there was plenty of time, and the food and drinks were terrific.
After being on an airplane for 10 hours, I didn't want to deal with public transportation in a country where I didn't speak the language. The driver was waiting for me after I picked up my luggage and took me straight to my hotel. I will definitely use this service again!