My daughter went to a dance course at Arcachan, France last summer. http://www.stagedansearcachon.com/en/stage-arcachon/. it is an international summer school with teachers from the Paris Opera and Bordeaux Opera ( Elisabeth platel. Charles Jude, Claire- Marie Osta etc..... She is going again this year. There is no residential accommodation but plenty of places to stay, as it is by the sea and very beautiful. We stayed at a campsite nearby. The teaching is excellent. They have classes for all levels. The advanced classes were amazing. My daughter went to the moyen (intermediate level).