I haven't read this book in many, many years, and I had fun reading it as an adult. (I did, however, have to suspend my concerns about the Potter children being told by the professor, a relative stranger at the time, to keep their project a secret from their parents. A mother's perspective, I suppose.) 
 A tale of complete fantasy that's simple and fun and sweet. I'm looking forward to reading this to my own kids someday. 
 I would probably give this four stars as an adult, but I remember being so enchanted with this story as a child that I have to keep my rating at five.