It was interesting and easy-peasy as well. Actually I've never read this book in korean version or watched a movie about her so it was worthwhile to get to know about Mary Poppins.
It's for children(covering the very last page, I found it was written like 'ages 8 and up' though), so there's nothing particular to remember or touching but I liked the part that the twins could understand the sun rays or starling's saying or wind and so on.
I believe, for children, it's quite good to provoke their imaginative or creative thinking.