We stayed here:
Borgo Argenina, Monti (10-15 miles North of Siena), 011-39-(0)577-747117
Mother and daughter are running the business. Small, tiny, old village (borgo=small castle) on top of a hill. Always look for venues on a hill, they have a much better view. Avoid Molinos (mills), they are always/mostly in valleys, needed the water ...