If you are visiting Paris with children, I think this must be at the top of your list, not only for tours but instruction and the shop offers some magical items as well.
11 rue Saint Paul
75004 Paris

While poking around the shops at Village St. Paul, I spotted this schoolboy at the end of this corridor. He and his friends were giggling and playing, so I walked through to see what they were up to. I found this gaggle of students with their teacher, just leaving the Academie de Magie, balloon animals and all! Shown here previously.