I went here last September (2012), with my son and his partner. It was easy to find with PLENTY of parking (free). We explored the Chateau and the Gardens, you could make the visit shorter if you only visit the gardens (which is cheaper). The gardens in September were beginning to 'go over' but there was still plenty of colour, roses, vines & grapes and some lovely little separate gardens as well as the famous Potager. The photographers among us especially enjoyed the 'wild' garden planted to attract butterflies and insects. We also found an exhibition of art in the gardens. There is a childrens playground where you can also picnic but there is no restaurant inside the grounds. The house is very interesting, especially if you take the audio tour - much better than a guided tour as each member of your party can go at their own pace and access additional information on something which particularly interests them (e.g the architecture or the art/ sculptures). There was an extensive video history of the current owners and their forbears, which despite only being on a TV in the corner of a room, attracted quite an audience, fascinated by the family history, how they came to buy the Chateau etc. etc.
I wasn't especially looking but I think that a visit to the house would be difficult for wheelchair bound guests or those with restricted mobility - quite a few stairs. No problem with most of the gardens though. Beware also that we didn't see any public toilets inside the grounds, besides those at the ticket office/shop when you enter. 'Go' before you find yourself the other side of the gardens or at the back of the house. Make sure you aren't hungry either, there is nowhere inside to buy food. We did however, enjoy a 'crepe' lunch just outside the entrance - if I recall, there is also a restaurant where you can get a full meal, if required. A great day had by all, thousands of 'photo opportunities', views and many different subjects of interest. I'll go again sometime.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.