The rental listing you are inquiring about is a SCAM! Greenwich apartment rentals go for much more money than this and the listing states that the apartment has views of the Hudson River. The Hudson River is in New York; not in Connecticut and cannot be seen from Greenwich!
Do not reply to the poster and flag the listing on Trulia as it's an attempt by the poster to gain someone's personal information or money.
I suggest that you work with a local Greenwich agent to find you a suitable rental home that most closely matches your needs and desires as they can send you legitimate rental listings.
Good luck to you!
Prudential Connecticut Realty