I went with my kids for the expo "pionneers of Street Art". The place is nice, access is free for children. We really enjoyed the expo, spanning both the main house and the garden. The experience was quite good, concerning the works exposed as well as their organisation and the accompanying cultural content on posters for example. The expo is of limited amplitude but really worth it in my view. The only minor issues I saw was with access, where we came at a "calm" hour, and queued only a few minutes, but when we left the queue was quite larger and I expect some people waited tens of minutes.
In the end I recommend visiting the institute when you notice an attracting expo, and I will myself follow its program and look forward to further visits.