We stayed here in the summer of 2007. It was 2 couples with a child each.
Francis was very helpful both in providing great information on the area and in preparing the house for a young toddler. His gardener checked up on us while we were there to provide local help.
The fact that the upstairs and downstairs both had full baths and kitchens seemed to increase the size of the house as it allowed both families to commingle or get our own space at will. There is a very good produce market down the hill and other good markets in town. Lots of vineyards within driving distance. Cassis is known for it's white, but our favorite vineyard was at Domaine Tempier about 45 minutes away as we have been a huge fan of their wine for years.
Though we loved eating in town, we found our best times eating meals on the patio followed by extended petanque matches fueled by the local vin. In town you can get fare ranging from Moules Frites and beer at a cafe to very fancy dinners. All over looking the water.
I would highly recommend it and plan to stay there again.