You say 4 months in the fall...what 4 months were you thinking of?? In Provence you will run into the mistral winds...which are not nice....unless you go way east..Cote d'Azur area. There certainly is nothing wrong with spending 4 months in Paris..in fact, it would be wonderful!! You will find many of the rental places will offer special rates for longer term rentals......Paris Perfect is great....vrbo.com...paris-sleeps..on and on.. I have rented a beautiful apartment in Villefranche-sur-mer in October..I often travel to France in the early fall..a beautiful time, without the heavy tourist traffic. I have spent Christmas in Paris. Enjoy, Joan