After Paris and before Florence we want several days to just simply chill. I spent the last week down an Amalfi Coast rabbit hole and found a lot of good options and fine tuned my preferred areas (Ravello and Praiano are in the lead based on properties we have found and descriptions of the regions). We aren't really planning beach days- more laze about on our terrace and venture out for food or cook in our kitchen. A view of the sea is pretty much my driving force. If we did the AC we would do a day trip to Capri and some hiking. We would fly from Paris to Rome or Naples and arrange transfers from there. I don't want a car there as the driving and parking situation looks challenging.
Nice also looks appealing and, in some ways, maybe easier? At the present time we do not plan to rent a car (I know from past threads on here that that is ideal but we just want to do the train as we have limited time and don't plan to linger or sightsee along the way). So train from Paris is 5 hours. We might rent a car to get to Florence though flights are less than $150 with 1 stop (no directs) and 3.5 hours; train is 7.5 hours.
If you had to choose 1 of these, what would you pick? I beg you to please not add any alternative locations/second guess my plan because, trust me, I have spent hours researching everything and my head can't take anymore decisions. I know we could be doing things different/better but I'm ok with that. Thank you!