Remarkable that he has been allowed into a Corbusier site...
From memory we carried him inside Petit Villa du lac Leman and also the Unite d'Habitation in Marseille. I can't recall if they let him in Villa Savoye (I don't think we even asked), and we didn't end up going inside Maison Guiette or Immeuble Carte.
That reminds me though - we chatted to the director of operations (??) or something at the Petit Villa, and he said an apartment inside Immeuble Carte had been purchased by their foundation I think and they were intending to eventually open it as a museum or exhibition type thing as part of the World Heritage site. Apologies I'm so vague on the details, this was a conversation I've just remembered from over a year ago!