Not sure of the closed day but if you have time on Monday or Tuesday, Jacquemart-Andre Museum is wonderful. Otherwise, I think it's a super itinerary. Expecting a report!

http://www.musee-jacquemart-andre.com/en/jacquemart/

According to that website, there IS no closed day for the Jacquemart-Andre Museum.

It says it is open daily throughout the year "with no exception." I hope that's true, it's on my list for my upcoming trip and I've never been there.