2 weeks (7/8-7/22) in Tuscany/ Florence, Rome, Sorrento. Suggestions on where to stay and itineraries please

Thanks to your wonderful suggestions, we dropped Monopoli for our first visit (my first, not my husband's) that's coming up soon. I know this is a very last minute planning at this point.. Questions underneath the itinerary. I enjoy museums, but I don't want it to be museum heavy since my husband is not a huge fan. He is def into rich history, he wants to visit Vatican, Zona Archeologica (Colosseum, Forum, Capitoline hill, etc..), Trevi Fountain, Piazza Navona.

Wed, 7/8 - Fly into Rome, rent a car and drive straight up to Tuscany

2 nights in Tuscany

Sat, 7/11 - Drive to Florence and drop off car (I assume no car in Florence)

2 nights in Florence

Mon, 7/13 - train to Rome

3 nights in Rome

Thurs, 7/16 - train to Sorrento

4 nights in Sorrento

Mon, 7/20 - train back to Rome

2 nights in Rome again before flying out

Wed, 7/22 - Flight in the morning (super early airport)

1. Should we do 3 nights in Tuscany and 1 night in Florence? or just stay in Tuscany 4 nights and do a day trip to Florence? I've heard some people has done day trip to Florence. Also no car is needed in Florence. Maybe 2 nights in Florence is too much? What do you suggest?

2. Where in Tuscany to stay.. such a big region and I don't know what I want to see. I definitely want to go visit Cascate del Mulino in Saturnia. I want to experience beautiful countryside of Italy while in Tuscany.

3. Staying near Piazza Navona or Trastavere in Rome is recommended for easy walking to everywhere? I hear Trastavere is cheaper.

4. Please advise if any tips on transportation. Current plan is to have the rental car for Tuscany only, dropping off when we arrive in Florence. Do you just walk to train stations from hotels in between cities? No taxi?

5. Sorrento is a good base to stay for Naples/Amalfi Coast, correct? What do you think of a day trip to Capri? I was not to keen on staying in Capri as I think we may be too tired of moving hotels with luggages.

6. Anywhere specific you recommend we stay at for two nights before flying out?

Thanks a bunch in advance!