I just ran this adventure during a WFRP campaign and it was awsome ! The adventure took place in Middenheim, just after playing "The Power Behind the Throne" and it fits perfectly well in this setting.
The beggining is very open as it can be run from the thieves sides or from the merchants side, the ending is also open and can lead to some very unexpected and enjoyable results !
My players where starting to get used to saving the world without much difficulties and with this adventure they almost condemned one of the biggest city of this setting !
Great roleplaying times !
[5 of 5 Stars!]