Visited with my 23 yo daughter. 12€ entry but no discount for mature visitors! An old house in this lovely part of Paris that has been converted into a museum and art gallery. Nearest Metro La Muette Line 9.
Some lovely rooms set out for original purpose eg dining room with furniture, paintings and sculpture. Also a number of gallery rooms with Monet and other impressionist paintings.
We were there 2 hours. Would have been longer but no cafe so needed to find somewhere for coffee.