As other posters have mentioned below, a rent of $409 sounds like it's an apartment share. There are no rents in Manhattan, or NYC that low for an entire apartment.
You should read the excellent renter's guide posted by RDNY.com. It will pretty much answer just about any question you have about the rental process. http://www.rent-direct.com/rentingguide/Welcome.html
Good luck to you on your apartment search.
As others have said, there are scams and this sounds like one.
Finally, a rental for $409 a month in NYC sounds entirely unrealistic. Most likely is a scam. Be as cautious as you can.
Good luck with your search. Do not hesitate to call/text/emal if your need further advice: 917-519-4664 or firstname.lastname@example.org
$409 doesn't get you ANYTHING in New York.
The fee structure is already explained below.
No fee means there are no brokers fees to be paid. It also means you would be renting directly from the landlord. I will say this, grab it. No fee rentals are notoriously difficult to find now as we are at the height of the summer rental season.
Lastly, where did you find a rental for $409 in NYC? that is truly a find. Good luck.