This is a cute little bookstore right in the hustle and bustle of León. They've got a great selection of new and used books in English, Spanish, Norwegian, Dutch, German, and a few more languages. And there are even some little locally made (and ridiculously cute) paper bookmarks and journals. If you're in the area and are looking for a book, I definitely recommend popping in.
Note: they've also got a table with lots of local info. If you're looking for a place to stay, eat, or an adventure -- or even just a map of León -- these folks are a great resource.