We were 9 families/couples (~30 occupants, but easily could have fit another 4-5 people) meeting for a celebration & relaxing summer holiday.
First off, the chateau looks smaller in the pictures than it really is. It goes quite deep, and is a good 3 stories tall.
Secondly, the rooms are enormous! Our room was a 2-room suite which was perfect for parents + kids. There were a few such suites. Each room (and suite) had its own full-bath. Honestly, I think my entire apartment could have fit in some of those bathrooms. In addition, there were also probably 5-10 ad hoc bathrooms scattered around the building & property, so really, all 30 of us could have used the loo at the same time.
The bedrooms were on the first floor and second floor. I think there was even a room of bunkbeds in the basement (and the basement entertainment center could easily have doubled for a kids' slumber party room). There are 5 or 6 large "living rooms/shared spaces" where people could hang out (i.e. the kids could escape from their parents).
I think it's a XVII(I?) century chateau, so there are lots of touches of history, but with just enough remodeling to be fully functional. The furniture, artwork, fixtures all seemed period-based (including a piano which probably hadn't seen a tuner in centuries), but bathrooms and kitchens were modern. There were two kitchens: a common one, and then an enormous professional kitchen, complete with all the tools of the trade. We actually hired their recommended chef for a couple evenings, which was nice because it wasn't always easy to plan meals for (and clean up after) 30. There were tons of refrigerators, including a huge walk-in restaurant-style cooler. And a wine fridge, which of course, got much love throughout the week.
The kids enjoyed the outdoor pool while the adults used the brand new gym in the adjacent, former-stables. There was also an indoor sauna and hot tub which we didn't use because the weather was too nice. Everything we needed for an active day was there. Bikes for adults and kids, tennis courts, massive grassy field, pingpong, billiard room, etc. We even hired a yoga instructor to come one morning.
Tons of hiking, mountain biking, outdoor activities all around (don't forget Tour de France!). The nearby town had a fabulous bakery (~ half mile away?) for our morning baguettes and pain au chocolat. And decadent French restaurants were peppered around.
The owner stopped by one evening to check-in and make sure everything was OK with our stay. He sad he had recently taken over the chateau and had been remodeling it over the past year.
One thing to note: the entire chateau was at our fingertips but that meant it wasn't a hotel. We bought our own toiletries and groceries. Cooked and cleaned up after ourselves. Took out our own trash/recyclables every day. Laundered our own clothes. Made our own beds (the housekeeping staff provided fresh towels). And closed our own front door at night. It's not a place to go with friends who don't pitch in.
But since we all did, it was a memorable stay (thus garnering this massive review). Would love to come back again.