The author, Peter Mayle, claims to have always loved Provence. He has been to Provence as a tourist, and then as a local after purchasing a house where he moves with his wife and his two dogs.
Because he has spent time in this area that he is writing about as both a tourist and as a local, he has a deep understanding of the place. As an outsider, he notices things that a local wouldn't; for example, how the French are the ones who litter on their own land, not the tourists about whom the French complain.
Peter Mayle wrote the book as a guidebook for those who wish to visit Provence, or perhaps those who, like himself, wish to purchase a home there. He has included in the book many details which are useful to anyone hoping to one day move there.
A Year in Provence