Novigrad. Poor man's docks north of Portside/Warehouses, west of bridge to Temple Isle, just west of where Dijkstra's sewers exit is.Getting back to Odrin - I know there are a ton of hilarious noticeboard notes about him, but I've never seen the actual NPC in the game. Mind posting where he is?
There's a shanty town hut of sorts, a pauper merchant who sells empty bottles, and a signpost that this is the "Odrin and friends" store.
Odrin is dead drunk and asleep next to the merchant.