Ah, okay. I figured most people would categorise it as fantasy rather than sf, that's why I was a bit surprised. There was definitely some inspiration, on my side, from the fantasy subgenre of stories about weird cities (John M. Harrison's Viriconium is the most recent example I read.)
In my experience, the public perception of the genres is: Fantasy = elves and wizards, and general weirdness, often with a vaguely medieval flair; sf = rocketships, robots and aliens.
(And yes, when I said FW is sf I was thinking of the latter definition... but how that fits together with the so far not-at-all-sf-like look of the City, well... you'll have to wait for part two for that! *g*)