In the ad it states the address is 1130 Festival Rd, San Marcos, CA 92078. The ad also states the property is "no longer active" on Trulia.
You may want to try Craigslist for rentals, beware of rental scam listings and ads that "look too good to be trueâ€. Make sure you talk to the person managing the property and meet them to see it. Scams usually involve people asking for a deposit prior to seeing the property or filling out a rental application. The "owner" usually states they live out of state or out of the country. Other scams involve people stealing pictures from home listings with a low rental rate.
Best of luck to you,
Mark & Kari Shea
Shea Real Estate
National Association of Realtors
CA DRE License 01713506