Big fan of Viva Chicken! Never had anything I did not like there and the sauces are amazing. I like all three but if you like some heat with your meal, go for the red/orange sauce, so good! But the other two will not disappoint.
My favorite thing to order is the stuffed avocado with chicken. Filling and delicious! But of course you cannot go wrong with an order of 1/4 chicken and any of the sides. Personally, I love the plantains and sweet potato fries.
And while you're at it, try one of the Peruvian drinks! They are different and pretty authentic to some I've tried in Peru.