Welcome @flore_roby
Be cautious with such institutions. At the very least, find out about refund conditions or not in case of visa refusal. But from experience, most of these private schools will refuse to refund you in case of visa refusal. Finally, at least you should know this before making any payment.
Campus France remains an essential step for almost all countries in Africa, countries with the so-called « Étude en France » procedure. For the appointment and processing time, it’s a real challenge. If others have tips for making an appointment, I am also interested.
For the accommodation certificate in Aix-en-Provence, I invite you to consult the dedicated article with answers to the most frequently asked questions by students.
Good luck!