I've drawn a rough sketch of the undercity district that Evelyn lives in. I've marked off some of the landmarks, and many of the locations listed in the story. There shouldn't be any major spoilers, but placed it behind a tag just in case. Sorry about the quality, I couldn't find a good program to draw it with, so it was done by hand.
The tale has been taken without authorization; if you see it on Amazon, report the incident.
If you want a sense of scale there are ten canals running North to South, and an additional ten running East to West.