We stayed three nights at the beginning of our 1 week break in France. We stayed in one of the rooms in the old orangerie (the old fruitmans room) and when booking wondered whether we should have booked a room in the main chateau to get the most from the stay. We needn't have worried, the room had loads of character and the orangerie also had a large lounge which we often used in the evenings to read etc after exploring the area in the day. We ate in the main house on one evening and the food was good but not outstanding. They do state that the food is French home cooking rather than gastro so this was not a surprise but I would recommend that you try it at least once as whilst you are paying a premium you are paying for the ambience of staying in a quite stunning chateau.
Swimming pool area was very good and even though the extended French family were there (it was the Bastille weekend), they are clearly aware that it is a guest house and you did not feel you were intruding and they made us feel most welcome.
Breakfast was good with wonderful homemade preserves.
Also make an effort to explore the grounds, we loved the old gardens.