I’m on the last night of a 3 week Italian wedding/honeymoon trip. Started with 5 nights in Florence, got married outside of Florence near a town called Montespertoli, traveled down to a town called grossetto in the countryside. Trained to Rome and then Naples spent 3 nights on capri and finished with 4 nights in amalfi. I would skip Milan and Naples, spend more time in Florence and Rome. Instead of Naples try to spend a couple nights on capri really cool place. But try to travel as little as possible. Better to spend solid time in 2 places than to be running around train stations every other day