You could have a look at Antico Pastificio they in Greve in Chianti, it is located in the town center and has both options for rooms and apartments.
I'm not sure if you are planning on hiking from place to place or if you will have a car. But if you have a car, I suggest you also look at http://www.tuscanyaccommodation.com/borgo-di-pietrafitta.html - this is a great position for planning hiking trips to the areas you mentioned while providing you with a beautiful yet central base.
