The castle sits on top of a small hill, and has a commanding view of the Tuscan countryside for miles around. 5 euro gets you entry to the grounds, family chapel, and a small taste of one wine at the nearby family winery.
It's an interesting walk around the grounds and atop the high castle wall. You don't enter the castle proper at all: that's still occupied by the family. The chapel is small, but interesting enough. A small crypt sits underneath. If your eyes are good and the day is clear you can make out Sienna in the distance.
The winery was a real let down. Nowhere near as welcoming as other similar wineries in the area, and very stingy with their tastings. Advice on wines that you may possibly prefer also wasn't forthcoming. Your ticket gives you one taste. No pouring from a bottle here; your wine comes from a stainless steel pipe at the press of a button, and you get an exact measurement. Small.
I'm not sure if it was the sterile environment, but my small taste seemed inferior to offerings from other nearby wineries. These other wineries were also more than happy for you to taste at no cost, and far more engaging and friendly. We did end up buying wine from elsewhere, but with their stinginess, and cold approach to visitors, certainly not from this place.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.