Tronsmo Bokhandel is the best bookstore in Oslo, possibly Norway. Or maybe the world? At least if you listen to Allen Ginsberg.
It's one of the few independent book stores, and is located in central Oslo. The curation of books is excellent, and the staff is well-read in all genres. Their comics section is legendary. They also offer a wide selection of English books, from across the world.
There's nowhere better to find your next favourite read.