From totally basic (bed – usually convertible, kitchenette – alcove with two burner stove, sink, microwave, refrigerator, tiny bathroom w/shower, chair, table, tv, armoire) to French provincial splendor and views of the Eiffel Tower, here are some places to begin your search for a studio apartment. Pictured is what you get for about $125 a night. Location: right off the Champs Elysees. Not much, but where you stay matters if you’re walking Paris. Remember to bring you No Worries Paris guidebook for all the essential routes.
AirBnb: budget prices, huge selection of locations
HomeAway: deal directly with owner, illustrated with photos
TripAdvisor Paris: a good solid source with photos and reviews.
http://www.vacationinparis.com: my favorite. They send you the keys. Nice variety hand selected, proven. Reserve early.
Paris Perfect: another agency with well located properties.
Start your search a few months before you go. The good properties that are priced low are snatched up by those in the know.