Also check out Apartmentratings.com

Good Luck!
R

i put a few in that might not have reviews as it is always a good idea to see the info from DIFFERENT sources on a place you are planning to rent from (and see various photos)

Reviews for sure
http://www.chicagoluxuryapartments.com/

Chicago Specific
http://www.apartmentsavvy.com/
http://www.1st-chicago-apartment-rentals.com/
http://www.chicagotribune.com/classified/realestate/apartments/
http://www.apartmenttherapy.com/chicago/good-questions/good-questions-visiting-chicago-022695
http://chicago.sublet.com/
http://www.jobsinchicago.com/chicago_apartment.cfm
http://www.hellochicago.com/YP/c_APARTMENTSRENTALAPARTMENT.Cfm
http://www.connectedrentals.com/neighborhoods.htm
http://www.chicago.com/apartments/
http://www.flvix.com/web/Apartment%20Finder%20Chicago.html

General Apartment Guides
http://www.apartmentguide.com/
http://www.apartmentsource.com/
http://www.101apartments.com/
http://www.apartmentguide.com/apartments/Illinois/Chicago/
http://www.apartmentcities.com/chicago-apartments/
http://www.mynewplace.com/city/apartment_rental-il-chicago
http://www.move.com/apartments_illinois/chicago.aspx