La Fonda is located next to Oregano's on Shea. It's a small little Mexican restaurant, but the food is really good. The salsa is delish and the margaritas can always bring a smile to my face. They're really strong, like a good margarita should be, and purchasing a pitcher of them mid-day when I should be working, makes them taste even better.
The waiters are friendly and fast, and I've never had a bad experience there. It's a casual place, so you can come dressed however you want, and it's the perfect spot for a quick meal. I've never had to wait for a table either- which is good for me, but probably not so great for the restaurant.
A couple of times, I've come here instead of going to Oregano's when they have their two hour wait going on, and I'm always glad I did. Give it a try next time you're in the area!