Angel Tea is an excellent asian-style restaurant located in Colinas Mall off of Avenida 27 de Febrero. It's easy to get to by taxi: just tell them "Colinas mall" and they will know where to go (it cost me 150 pesos from the historic center, but maybe your bargaining skills are better?). The restaurant is located in the food court of the third floor of the mall, next to all the generic mall food places. It is definitely worth a visit, for the variety of food, the taste, the price, and the very nice couple who owns/operates it.
Cons: Located in a mall food court