We stayed at Hotel Saturno just for one night on July (we didn't know the hotel before and we arrived at 9pm without reservation): the owner of the hotel welcomed us as we were members of his family and we were soon conquered by the astonishing views of the valley (the hotel is located on the top of a hill)... When we woke up, we discovered that the hotel was equiped with a swimming pool and a jacuzzi (with hot thermal water) that we could use for free... We spent a relaxing morning under the Tuscan sun and we were just too sad when we had to leave at 2pm!
And the most important thing: we only paid 50 Euros par person (but prices are a little higher on August, I think)! I'll give you an advice: enjoy staying here before this place become too popular! This hotel was a masterpiece!