If the landlord does not respond, move on. Chances are the property has been rented.
Be careful, the Craig's list rental scams are popping up on trulia, zillow and other web sites.
Never send money always meet ppl in person at the rental agency or at the property. Bring a friend too.
If the rental price seems to good to be true it might not be real.
Rental rates in the Raleigh area are $300-$400 per bedroom is a very good gide. Some a little less some a little more. Several areas are in high demand that rental prices are $100-$150 more per bedroom.
There are many good rental agencies around. May I suggest that contacting a rental agency is a good option.
Best of luck