Thanks for all the support, Ellen, Karen, and Phyllis.
Since this is just an intensive one-week course, and I do not want to spend my life savings, I have narrowed it down to:
Ecole France Langue, rue de Sfax 75016
Lutece Langue, 23 blvd Sebastopol
L'Atelier Prive des Langues, 75 rue des Dames 75017
The total class time appears to be fifteen hours and the price in the neighborhood of €200 or €12-14 an hour which doesn't seem unreasonable.
Two others, Institute Parisien and Accord offer 20 hours and are another 80 to 100 € and, at least according to their websites, larger classes than the ones I am considering above.
One of the schools had me take a proficiency test on line to find out my level. The others will send a test after I pay.
A lot of schools have a minimum of two weeks or are for the whole term so they are not suitable.
Of course, I would like to spend a couple of weeks or month for total immersion, (and I do have a bunch of them saved in my Favorites), but that is not an option right now.
Actually the French teacher that I liked when studying here in NYC organizes a small group once or twice a year for five days to go to France and study intensively with her along with sightseeing. I always thought her fee was high plus the time frame was no good but that is also a future option.
I am leaving the Saturday after Thanksgiving and will be in Paris until 12/5. Anyone interested in a GTG can PM me.
As far as shopping, the two apartments between which I am deciding are in the 1st and 2nd arrondisements and dangerously near Longchamps! It may be time to add to my collection.....