We stayed here last summer ('13) and for us it has the perfect ambiance; mostly due to the authenticity of the place. The 2 brothers (and staff) don't pretend to be anything else then what it is. But that is high quality, pure food. Absolutely delicious, and served with pleasure and hospitality. This is what eating should be like, for me that is of course.
Furthermore the room was perfect, with a huge balcony in our case.
The location is perfect for discovering the (beautiful) 'Val d'orcia'. Chianciano term itself we did not see very much.