re: Personal experiences in these Italian cities?

Great trip. Been to Tuscany twice and Rome several times. Spent a week in Positano in 2014. 3 days in Siena is enough time to visit Tuscan hill towns. Near San G is Voltera. In the other direction is Montalcino and Montepulciano. Favorite restaurant in Siena is Da Divo down the street from the Duomo's Baptistry. Terrific food and the restaurant is built in an old Etruscan cave. Positano is one of our favorites. If you have time you can catch the ferry to other towns along the coast such as Capri, Amalfi and Ravello. Since this is your honeymoon I have a suggestion for a big splurge dinner in Positano in what may be the most romantic restaurant you will ever go to - La Sponda Restaurant in Le Sirenuse Hotel. It has large picture windows overlooking the Mediterranean and the Positano hill and at night it is lit with 400 candles. And the food is fantastic.