I went to this place twice during my stay - pretty unusual for me to visit the same place when I travel as I tend to want to experience different things. It was the Capchi de Setas, their signature wine based soup with a quinoa studded puff pastry that drew me back. Great service and ambiance too.
I also went to the #1 rated restaurant in Cusco on TripAdvisor but in my opinion MAP Cafe is so so much better.
Note that in the evening they have a set dinner menu (you can choose from starters, main course and desserts). There is a cover charge if you want to order a la carte for dinner. It's okay if you want the full meal (the soup is in the starter section), but if you only want to try the soup and perhaps have a light meal, go for lunch for great value.