I love Los Favoritos!  Mi favorito is the chorizo breakfast burrito (most popular item there?).  Interestingly enough, I think it's bigger if you order it for dinner than for breakfast, but for either it's plenty big!  Muy rico with salsa verde.  I'm embarrassed to say that I've only had a few of other things on the menu (quesadilla and other burritos), but they've all been delish!  For some reason, though, I just get my mouth set on chorizo burrito.  It's seductive.
The folks there are very nice and sincere, and they know English well enough, although I think some are working on it.  
Tip:  You can order ahead!  Especially helpful if you're going during the lunch rush, when it seems like every kid from Seton H.S. is there.  it's pretty nice to breeze in and pay and grab your stuff when there's a gaggle of folks still waiting for their order to be called.    
Tip 2:  If you don't order ahead, you can place your order there and then go across the courtyard to Starbucks to grab a coffee (that probably costs more than what you got at Los Fav's) while you wait for your food, if you're so inclined.  This is a bad habit you might not want to get into.  Believe me!