My son went for three years. I have only positive things to say. The engagement with nature, the different stimuli, the process of eating in the dining room where the children are served and clean up by themselves. The excellent diet and food too. The educators who know well each child individually and point out his strengths and weaknesses.
My child was acquiring positive characteristics for his ability and this was also visible at home. Those of us who are parents saw our children’s next school in primary school, we understood that we will not easily find a similar school.
On the negatives, I would only add that the tuition fees are not negligible and the school was one (with the result that the last children, like my son, spend too much time there).