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The Marmotten is fantastic, we were there in 2000, but you might just want to check as I think it is closed for renovation. I know a lot of it's artwork is currently in Melbourne, but not sure when it will reopen.
Sorry, New to this. I spent time in Paris in both April and November. Not crowded, weather not too bad. I got a 5 day card that covered museums, bus, metro, even entrance to Versailles. Didn't have to wait in lines, even at Notre dame. You just walk to the front and show your pass. Definitely go to Muse D'Orsay (spelling?). Enjoy your trip.