Lala's is one of my favorite restaurants in LA. Despite being located in the trendy heart of Melrose, Lala's never comes off as being pretentious or snooty. I've had pretty good luck walking right up on a Friday or Saturday night and getting a table relatively quickly. I also adore its patio, which has an outdoor atmosphere, yet has the warmth of a cozy indoor dining room.
Two words - Milanesa Napolitana. This is what I order for my entree every time. It's sort of like a cross between chicken fried steak and chicken parmesan, with a little Argentinian kick of flavor. Yum! I also sometimes order the Provoleta for an appetizer, which is just melted cheese, but it's oh so good. The bread with their oil and herbs is also amazing (I don't even know what they call it, but it's potent and addicting).
I knocked off a star only because I went there once for my birthday and they stuck us indoors in the corner, but other than that one experience, Lala's has been great. Make sure you order some sangria.
Pros: Food, atmosphere, service
Cons: Sometimes no parking