We used a Private Driver to do both our first med. trip. I'm glad we got to see both. He was also able to take us to the front of the line to see David. Which piffed of a lot of ships tour passengers behind us. Cost can be quite reasonable if you can find a group from your roll call.
We've subsequently been back to Tuscany for a land trip and have been able to spend more time in Florence, which it truly deserves.