has anyone used a private guide for transportation and excursions while in Florence?
Rick probably has suggestions in his book, doesn't he? Or ask at your hotel, someone's brother or cousin is always available to drive and narrate
Yes - there are many recommendations in the RS Florence book.
We also did TWO group tours with WalkAboutFlorence - we did their BEST OF TUSCANY TOUR and CHIANTI WINE & FOOD SAFARI TOUR. Both excellent. Their website has lots of details and photos and it's easy to book on their site.