A Walk on the Waterfront
Side quest Novigrad suggested level 12
From the journal
A certain nobleman asked Geralt for a bit of assistance. He wanted the witcher to accompany him on a stroll through a rather dodgy part of Novigrad. The richman's clothing alone would get him killed in that quarter, so Geralt agreed to help.
The witcher defended the aristocrat from bandits as he indulged in a bit of slumming. Not his most glamorous contract, but neither was it the worst thing he'd ever had to do for coin.