Buongiorno -
if you are up to moving around a bit then I suggest that you plan half your stay in the city center of Florence so you can 1) save on not renting a car to get you around and 2) enjoy the full experience of Florence - just walking along the Arno River at night is beautiful. I would also suggest combining your trip to Cinque Terre when you are in Florence, it is easy to take the train and visit this beautiful place and it is less stress than trying to drive.
In Florence you can stay at hotel or even a B&B like:
http://www.tuscanyaccommodation.com/...a-firenze.html
Then you can stay in the countryside, closer to Siena for a few days, and this way you get the best of both worlds (so to speak). Not only is this area very different from Florence and the surroundings but it offers an excellent point for day trips to Val d'Orica. Have a look at this agriturismo:
http://www.discovertuscany.com/siena...in-poggio.html
Buon Viaggio,
DonnaDenise
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