The book has a college-age girl gets hired at a supernatural bookstore as a editor for a city guide, and involves zombies and other creatures. It also involves citywalkers who hear the personality/voice of the city itself.
This sounds like "The Shambling Guide to New York City" by Mur Lafferty.
A travel writer takes a job with a shady publishing company in New York, only to find that she must write a guide to the city - for the undead!
One of the reviews descriptions' highlights both the 'guidebook' part and the 'unusual bookstore' where she discovered the job.
Zoe has returned to her hometown after an editorial job at a travel book publisher –and her affair with her boss–ended disastrously. She’s browsing an unusual bookstore when she notice a man posting a flyer seeking a guidebook editor. The advertiser and others attempt to dissuade her, but she perseveres, finally taking the job after an enlightening dinner with the new boss.
I found a reference to the city-talker element in the description of the second book ("Ghost Train to New Orleans") which I'll hide because it's possibly spoilery for events in the first book, though the citytalker concept possibly appears earlier.:
her new-found ability to talk to cities seems to help.