You did not provide enough information (link to the address of the property) but if the ad looked fishy I think that you should trust your gut feeling and be very careful. There are a lot of rental scams on the internet
Hallmarks of a typical on-line rental scam:
1. Rent is lower than it should be for the subject property.
2. Property cannot be seen
3. Because the owner is out of state or out of the country. Just drive by and peak in the windows.
4. Sent money (wire good funds, no personal checks) and the keys will be mailed to you.
Often accompanied by a story that the owner had to relocate suddenly and they are looking for a good family to watch over their beloved house until they returnâ€¦thus the low rent.
Also, watch out for similar scams in which the â€œlandlordâ€ wants you to fill out a rental application which provides information of a personal nature which the scammer can use to steal your identity.
Otherwise beware. I have seen fake landlords go so far as to send fake rental agreements and provide keys to visit a vacant home; then they ask for the money to be wired to them somewhere in another country.
Be very careful about lower than market rents. Not "a bit lower" where the landlord is just motivated; but say 50% lower. Be very careful!
I would contact trulias customer service to find the exact or correct information regarding the rental posting or property.