Went to Gustazo's in Waltham yesterday for lunch w/ a friend. Public parking around the block off Main st. made it easy to not worry about finding a spot. The place is simply decorated and has a nice warm feel, nothing fancy (which I like). It was about 2/3 filled, we were seated quickly and the varied but short lunch menu made it easy to order. I had the chicken sandwich accurately spiced and garnished. Friend had the burger much to his liking. We split plantain chips (mild) and cuban potato chips (nicely spiced).. Both went well with the sandwiches. Service was attentive and warm. All in all a very enjoyable experience and I expect to return for another lunch and dinner.