We were in Florence last spring and used the following company for a private tour. They also offer tours in Rome and a number of other cities. They do thematic walking tours which are led by scholars, art historians, architects etc. The tours are geared towards adults as well as families.
We took the Medici tour. Our guide, a PHD candidate studying in Florence, was outstanding. We all wanted to stay for a week and take his tours every day.
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