Daniel, the lovely scenery you admired was in Sonoma.
They changed part of Sonoma Plaza to Paris, made the Ledson into a Parisian bistro (with the help of a Deux Chevaux and a stately old Citroen, and the old heritage buildings around the Plaza. Many of the scenes were also shot on the Kunde vineyards grounds and up through the Sonoma Valley.
I think it is amusing that, through the magic of Hollywood and constrained by a limited budget, they used Sonoma as a location for both Napa and Paris.
Had they used our wines, it would have been even more delightful.
Hadn't planned to see the movie, but now I probably will, after learning of the locations. Of course, I'll have the advantage of not having to pretend to pay attention to anything but the lovely scenery.