Galluis is a small and quiet village. There are all the needed shops within less than 2 kms in the next village.
The nearest train station is Méré-Montfort l'Amaury about 3kms where you can go to the heart of Paris in 35min.
You can leave your car overthere in a free and large parking. In case you don't have any vehicule, a bus can take you there every hour