If you go to firenze( florence), just a few miles away is San Gimignano. it is half way between Firenze and Siena.
a small little village on top of a hill with lots of towers....and beautiful stone streets( you even got "the best ice cream of the world there....")
In you plan I can find Siena...
If you go to toscana mate, you HAVE TO see Siena. For my part, a lot better than Firenze.
but also really different.
if you have a car just drive around between these two cities( not on the highway but really on country side roads) and you will find at every corner just the beautiful tipycal toscany view...
You 're apparently looking at north italy, which is good, but if you can, go to Napoli, a bit south of it is the Amalfi coast, and there is a paradise on earth...
if you need anything else for italy ask more precisely, I will try to help you with what I know from this beautiful country