Friendly and helpful staff, good location with private parking and a helpful staff. La Pleiade has a good selection of books, including grammars for those who want to improve their French (which is my case). They also accept cards and have a good parking with security available right beside the commercial centre Promenade, the same centre where La Pleiade is located. If you're looking for a good book shop in Pétion-Ville, it's worth visiting this one.