Reviving an old thread, but I've been there during Winter last year and felt like the coaching was really on point. The amenities are great and the camp's organisation is a well oiled machine.
I went for a week long camp, full day and they mix and match physical training (tennis specific exercises) with on-court time pretty well. The "extra" sessions are informative, but TBH could be skipped for extra leasure time in the French riviera.
If you're considering going, picking the low season is probably the best since you can end up in group of 2 players for a coach, or even one on one for a thrid of the price in summer.