Ciao Thor,
Do you mean the Le Fornace di Racciano, the one listed here ?
It might be that the mispelling is what is showing no reviews since I see it is on TripAdvisor with mostly excellent reviews.
Other good options right outside of San Gimignano are the Agriturismo La Lucciolaia and Niccolai, both listed here where you can read the short review before going to the site:
http://www.discovertuscany.com/san-g...accommodation/
(Fornace di Racciano is also listed).
Leaving Florence in the afternoon is fine, just try leaving Florence before 5pm as the traffic you find will be mostly in Florence all the way to the Florence-Siena road. Once you're on that, you should be fine.
Staying near SG makes sense, especially since you want to experience SG and Volterra. The difference in time between there and Siena on your way down is really minimal so it really depends on just finding a place you will all like. A pool is more likely outside in the countryside that in town, so even if you want to stay closer to Siena, look for something outside of the borders, such as La Selva or San Fabiano listed here: http://www.tuscanyaccommodation.com/siena/
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