Crypt in the Sewers
From Witcher Wiki
The Crypt in the Sewers is (as the name quite obviously suggests) a crypt in the sewers of Vizima which is behind a locked gate. Geralt is given the key to these gates by the con artist who hangs out by the sewer entrance every morning between 06:00 and 09:00.
Inside is a fairly standard crypt, guarded graveirs and ghouls, about a half dozen of each. There is also a nicely stocked chest in the deepest, darkest chamber, along with a campfire and a corpse.
