According to a very short IJ article, it's Salvadoran with the same owner as the El Tazumal in San Pablo, and whose brother owns the one in Richmond. Cuisine from El Salvador and Mexico and some specialty dishes from Nicaragua, Honduras and Guatemala. One very good Yelp review by someone who sounds like a responsible reviewer.
1444 4th St
San Rafael, CA 94901
10 am - 9 pm Mondays to Saturday, 9 am - 9 pm Sunday