Looking for Good Falafel in Coastal Orange County
Coach's has decent falafels. Not going to be the most authentic, and probably not going to live up to the OP's "amazing little restuarant in Spain"; but they're good enough to satisfy a craving. You can also get late night gyros at the liquor store/deli next to Coach's on Main Street, I think it's Surf City Market. Nothing to write home about, but at 1am they do the trick.
There's also Avo's on Warner and Gothard in Huntington Beach (where Rombi's used to be). I've only had the gyros and the lamb at Avo's, and it's been pretty good both times.
The best gyro IMHO in the area is at Greek Island Grille across the street from South Coast Plaza, on the corner of Bristol/Sunflower in CM.
Also Greek Town Grille on 17th in costa mesa, probably the closest to Newport. I believe Greek Town Grille is run by the same people who own Aegean Cafe in Laguna Beach. A pretty standard gyro at GTG, kind of reminds me of Daphne's.
Not too sure about coastal OC, but if you are willing to drive a little inland, you must try Sahara Falafel, a hole-in-the-wall that does 'em just right.
I also like the falafel's at Zena's in Orange.