1 does the price seam to good to be true (it probably is)
2 is the person running the add out of the country ( it is my experience that these criminals will use a long sob story to take advantage of potential renters)
3 are they asking for your money up front. ( legitimate agents and owners would not do this)
I hope this helps.
Your best is to meet the agent in person and check to see that their DRE license number is current.
I would advise that you contact the recommended realtors in your area and work with them. It's a lot safer for you and you'll have more resources are your disposal.
If you aren't sure about a particular listing posted on Trulia, you should contact a local Real Estate Agent who can verify the legitimacy of the listing. Your Realtor will be able to access the listing in the Multiple Listing Service to provide all the details available, and if you are interested in it, they can arrange a time for you to view it.
Was there a particular ad or listing that you were curious about? Feel free to shoot me an email with the address at GaryWolyn@kw.com, and I would've glad to assist you.
Have a great day!
Licensed Real Estate Agent
Keller Williams Realty