re: Looking at Paris at the end of October

Everyone has their own personal favorite parts of Paris. I especially like staying in areas with some traditional shopping options (butcher, baker, patissier, etc), and I don't really care about "luxury". So I'll suggest:
--the Sentier neighborhood, around the end of rue Montorgueil (a historic market street). Good transit links,lots of food options, and not completely touristy.
--the NoMa, (Northern Marais), aka the Haut Marais, around the Arts & Metiers metro stop and Republique metro stop. The old covered Marche des Enfants Rouges, a food market with stalls, is nearby.
--more touristy, but still an interesting area: Odeon, on the Rive Gauche. Lots of cafes to choose from, and easy RER transit links to CDG via the Jardin du Luxembourg station.