Christine - I have to say Luberon is not my favourite part of France - too many Brits, too hot and dusty and virtually impossible to get into places like Avignon. Yes, the scenery is stunning in places but it is an expensive area ( mainly because of tourism ) and the food is not that good. There are a couple of sites worth visiting if you are looking for a long-term house rental. Try
www.connexionfrance.com . This is an English language newspaper published in France with an extensive classified ads section frequently featuring properties to let. You can order a trial copy free-of-charge via their website. Another possibility is a website at
www.thisfrenchlife.com which features classified ads - you can advertise for a property in the region of your choice, period and price band. One other suggestion is to conact Brittany Ferries in Portsmouth. They have an extensive portfolio of properties to let throughout France ( they also own Gites de France ) and it may be you can cut a deal with them.
Our bit of France is right in the middle in Indre-et-Loire which is thought of as the "garden of France". We are basically equidistant from all the borders of the hexagon even though a journey, say, to Annecy in the Alps will take eleven hours and about the same to the Mediterranean coast.
David Line