We had a nice light lunch at this cafe which is located inside the Casa Del Corregidor on the Puno plaza de Armas. It was super sunny so we sat in the courtyard which was lovely. We had some frozen lemonades which were excellent, as well as a Cesar salad (very well seasoned and full of crispy bacon - not so much chicken though) and a meat empanada which was ok.
They also have a large indoors area.
Would definitely recommend for a light lunch, refreshments or drinks.