You can’t beat the the Louvre area no matter what the age. The Tuileries are extensive and open with wide allées to run through, a huge fountain basin to splash your hands, benches for resting, ice cream vendors, one of the world’s great museums with every kind of construction to fascinate your children - our 4-year-old ran up up the stairway to the winged victory SCREAMING “”This is beautiful!” The 6 year old wanted to know what would be the most expensive piece and kept a mental catalog.
Stay across the Seine at the Hotel du Quai Voltaire. The three bed room will be perfect. You all can look out at the passing boats and cars, you quietly enjoying an aperitif while the kids take their baths.
The service is cheerful and very professional. The staff will get you what you need, from a taxi to the bateaux mouches to the best place for a pony ride.
You will love it!