Hemingway & most other published authors alive or dead have attested - books & booze are a magically meaningful combo.
This Rynek café pub & unofficial social club is filled with thousands of books & their chivalrous shelves. Granted 80% or so are in tongue torturous Polish, but you can find a fair amount of gems in French, Russian & even my mother tongue (Ehnglash). Not your typical market square tourist trap.