It seems that this warehouse in the slums area of the Temple Quarter has gotten a lot of use through the years.
In The Witcher computer game
The warehouse is where Vincent conducts his little "sting operation" on the local Salamandra he has recently identified. When Geralt gets out of prison, the captain suggests that the witcher stay way from the warehouse in the slums, especially around midnight. A witcher's sword would not be needed then. Indeed!