Located right in the city center, Shakespeare and Sons is really ideal place to escape the tourists or the summer heat. Wide selection of both, new and second-hand books, will make You go crazy. True, it's an English bookshop, but don't worry, they have also many French books (and a bit of German, Spanish and Russian) downstairs.
Check out the section called "Czech authors" - no matter if You are looking for Kafka, Kundera, Hrabal or some unknown collection of old poems, they have it all. Escape to the basement is highly recommended as the artsy books and an amazing chill zone will surely take Your breath away.
Right next to the counter are always some treasures waiting to be discovered - maps, notebooks, super cheap books etc. Come and see for Yourself!