Yeah I know it's a little late, but I was going to stay there this summer, but are reservation got screwed up. Oh well, they got us a room at the place next door that they had connections with and we got a discount, and they gave us the free breakfast aswell, which was decent.
Also a FANTASTIC place was Ostello Villa Camerata which is just on the edge of town. You have to take a 30 minute bus ride but it is worth it! Just tell the bus driver where you are going and he should tell you where to get off. It is kinda at the end of the bus line so don't worry if the bus empties out completely! Also the downside is there is a 10 minute walk to the hostel up their long driveway. But let me tell you, this place is fantastic. It is absolutely gorgeous, and it is cheap, 13E for a dorm room I think. They give you breakfast and dinner which are usually both quite decent, and it is in stunning scenery. Now, don't get freaked out if you think it is way outta town, because it is and it isn't. Its not completely inconvenient to get to, but let me tell you, the trek is worth it!! Stay here! No reservations, so get there around noon to get your bed. The olympic pool is nearby too if you wanna go for a dip on a roasting Tuscany afternoon. Highly recommended.