Renting in San Diego, frankly, is a disorganized screw job for everyone involved. Realtors don't make any real money helping tenants find a place and tenants don't have any one resource they can rely on. That said, I would encourage you to consult with a Realtor if you're looking to rent in downtown San Diego.
It's free. And that professional, namely me, will have some insights for you because we deal with all aspects of 92101 real estate on a daily basis. Unfortunately, websites like Craigslist are still a valuable resource when you're looking to rent. Please keep in mind that we don't really get paid and we're mostly doing it as a courtesy. We're really hoping that in exchange for a little goodwill, you'll come back to us after you've realized that paying someone else's mortgage isn't all it's cracked up to be and you want to buy a condo. Or maybe you'll say to yourself "That dude is really nice and knows what he's doing" and will refer your friends, family, and co-workers to us for all of their downtown San Diego real estate needs. It's all good.
Looking to rent? Please answer a few simple questions and we'll get the ball rolling!