This is sound advice (brick trolls almost always drop 2-3 blood vials), however at point 2 I would clear out the house then run back up the stairs and aggro the two werewolves and let them follow you down to the house as they can't get in the entrance, so they're easy pickings and you should get 3 vials from each of them as well.
Those are the beasts I mentioned, yes, but good point with the cheese tactic.