The Complete Brambly Hedge by Jill Barklem
I read this series when I was growing up, and what I love the most about the stories are the intricate illustrations in each story. The beautifully rendered cross-sections of the houses where the mice live are the perfect place to live. I want to live there!
I consider this collection of stories to be classics that every child should read. However, from what I have found out, they are currently out of print. Even though they may be hard to find, try your local library.
Publisher: Atheneum Books for Young Readers