Personal opinion
I think "Esio Trot" is a good book to childrens and people who are learning english because is short, funny, easy to understand, with a good estructure, with few characters and with a lot of pictures.
I recommended this book to childrens because was made it by Roald Dalh, a nice author of UK literature.
An the last, Thanks for Benjamín Katz for lend me this book!