So you do have a car but don't want to drive it into Florence?
The best and easiest solution is to just drive into Montelupo Fiorentino and take the train from there!

you'll arrive right into Santa Maria Novella and the Deanna Bar/Terracafe' is right outside (exit the station to the right as you arrive from the tracks).
You can check train schedules on trenitalia.com
The Montelupo station is called "Montelupo-Capraia"........
now this works for your day in Florence ONLY because trains start running around 6am from Montelupo so you won't arrive in Florence in time for the tour you have at 6:15am.
On that day, you can drive your car to Scandicci to the Nenni-Torregalli tram stop (there is a large COOP supermarket right across and you can park there) then take the tram stop to SMN train station (end of the line in the center of Florence). The tramvia starts running at 5am so you're set to go - check time tables here:
http://www.gestramvia.it/
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