If you credit score is under 640 stay away from management companies. Don't waste your money on application fees.
Try Craigslist and domu.com and look to private landlords. Also be prepared to be 100% honest. Hopefully your landlord history is flawless?
You may be able to secure an apartment with a co-signer or with additional security deposit, too.
I once repaired a woman's credit in 60 days. I took her Transunion the 400s to 720.
I would be happy to help you find a home downtown. I specialize in that area.