Einar
 Gausel

Einar Gausel is the other important merchant in the Nonhuman District. He sells only books, most of which have no effect on quests but let you learn more about the game’s lore. Do note, though, that any book he sells that pertains to monsters can be read to give Geralt knowledge of that monster’s strengths and weaknesses. A few quests require that you acquire this knowledge in-game, either by slaying tons of the appropriate monster or buying the right book from Einar. It’s worth picking up his books about various monster types if you have cash to spare.

Einar is also a barber. That is, you can visit him and pay a few orens to change Geralt’s hairstyle into something else. Looting Einar’s shop lets you find a rare armor enhancement called the dwarven enhancement. It’s one of the few +2 enhancements easily available in the game, so stockpile it for later use. As a final note, you can get services from Einar at all hours, even if you have to wake him up in bed.