Castell Sant Mori is a wonderful place to host a large group. There are plenty of spaces - 2 large living rooms, a study, an office, large dining area - all the spaces you need inside. And the outdoor area is beautiful with the courtyard and the terrace. Mariano lives near by for anything last minute you need. The dining room and kitchen have just about anything you need for cookware and serving plates, etc., so you just need to bring groceries. As any old, large space, there are a few quirks to be aware of, like it takes a bit of time to heat the castle.
Overall, would highly recommend staying here.