Welcome!

Patience, patience, patience . . . small bikes are hard to find!

A lot of people seem to like (cyclo)cross bikes for city riding, so you may want to expand your research to that category as well. I don't have one, but but I have been coveting the ones I see around Seattle. They seem very versatile.

If you continue to shop craigslist, be sure to verify that the seller is the rightful owner of the bike and has the right to sell it. Ask about the history of the bike, how long they've had it, why they're selling, etc. Craigslist is a wonderful resource, but bike thieves also use it to pass off stolen goods.

If you suspect someone is trying to sell you a stolen bike, you can run a search for it at finetoothcog.com or stolenbicycleregistry.com . . . or just walk away. Bike thieves are evil, evil people. Do not support them!

Back to bike-shopping advice: seems like you've visited a lot of bike shops. Is there one in particular that stands out in terms of customer service, fitting services, etc? Did you talk to any salespeople who really wanted to help you find a bike that fits your needs, vs. trying to sell you something on the floor that might be a smidge too big for you?

If you feel strongly about a particular make/model but your size is not in stock, is there an LBS that will special order it for you?

Best of luck -- it can be a frustrating process, especially when bike shops don't have much that you can test ride.