I've read the Atlas of the DC Universe entry, but I'm really more interested in depictions from within the comics.
What's the population of the city? Is is old or new, mostly (how much of it was designed for walkability v. cars)? Major industries? Is it one of those declining cities of the midwest or a more thriving/growing one or something in between? Since Wally's kids did get older, did they ever mention the quality of public schools?
What's its particular flavor to you?