There are not alot of good places to find apartment rentals downtown, but Citi Habitats is one of them.
Our agent had TONS more listings than most other agencies my wife and I visited. We ended up choosing somewhere that had NO FEE to us (the building paid them to show the apt).
We love living downtown, and Citi Habitats helped us find the right apartment for the right price.
I hope your experince is as good as mine...