I liked working with children and teaching them how to build legos or walking them through programming their robots.
What I wish was different
I wish there had been more assistants given the number of students in the classes. Only three people are available to give attention to 24 students, and they often do not thoroughly understand the material before they move on.
Advice
It's very helpful to have previous experience working with kids and resolving conflicts between them. I'd recommend looking up tips here. It's ok to learn as you go in terms of building legos and programming!