It's not all about recommending where you must go, but sometimes, where you must avoid going, for various reasons - food, service, ambiance.... if you want my reasons, check my blog.
My favorite spots for shawarma in BA, from #1 to #10. It actually skips a couple that don't show up on Foursquare - at some point I may go and add them in.
"Good, Argentine style pizza. Biggest plus, they allow half and half on small, individual sized pizzas, a rarity here. Biggest minus, a whopping "cubierto" charge making the meal rather expensive."
"Really good pizzas, lots of flavor, generous toppings, and huge! One pizza was two meals for two of us. And, a great spot to stop and have a late afternoon vermouth."
"A sort of cross between Argentine and Neapolitan style pizzas. Crust, sauce, cheese, toppings, all good, and plentiful, but all a trifle bland, like everything needed a good pinch of salt."
"Excellent Vietnamese (and a little Thai) food! Great service. Not to be missed? The banh xeo (stuffed rice flour/coconut milkpancake) and the drunken noodles!"