We took our family there for a break from big city tourism and we all wished we could have stayed even longer. As noted by others, Marina is a wonderful and gracious hostess. She and her daughter and assistants worked tirelessly to make the stay comfortable and pleasant. If not for the distance, I'd plan all my vacations there. Really.
Don't miss her dinners. They are 2+ hours of excellence. The rest of my family took a cooking class and they had a great time. The pool was a welcome treat in the July heat. You'll want a car for touring, but one morning, we walked to Radicofani and toured the castle. It is about 10km round trip, and a nice walk on the road.