The lunch here is great. It was 9 soles, and you get a wonderful meal. Started with a small salad and a bowl of soup, then you get to pick 4 items from the buffet, and they bring you a drink and a dessert. The soup and dessert change every day, as do the choices at the buffet. Not everything is vegan, so be sure to ask. They had some kind of scalloped potato-type thing and a veggie pizza with cheese the day I went, but the rest of the dishes were vegan.
They don't seem to be open for dinner, and not open on Sundays. They get really busy at lunch, so go early (around noon). We went at 2:30 one day, and they couldn't fit 4 of us.
Cons: can be busy