We booked the half-day 4-hr private tour.
Short version: Book it!
Prompt arrival. Great English. Lovely car. Personable service. Locally owned. Remarkably efficient. Totally flexible/customizable.
Detailed version:
Chris was waiting on us right outside our hotel, driving a very nice black Mercedes. We were checking out of one hotel and being dropped off/checked into another at the end of our time together, so he loaded up our luggage. Right away we noticed that he was friendly, flexible and spoke great English. He is a native of Vienna and really knows his stuff. Our party was a family of 3 including our 8-year old son. We wanted to see as much as possible, but we did not have a detailed plan for how to spend our 4 hour, half-day together. After a quick 5-minute on what we’d already seen (which wasn’t much at that point), he devised a plan and we were off on a comprehensive journey through the city. We covered SO MUCH ground, stopping several times to stroll and/or take pictures. He explained details and history along the way. He even got a local sweet treat for my son to try, which he loved. We got recommendations for things we should do later in the day when we had a little more time which we did for a wonderful evening. It felt like we not only covered history and sites, but we got lessons in culture as well. This was money well-spent for a great overview of Vienna!