This small cafe serves tasty homemade lunch that is vegetarian (and I believe vegan also but you'd have to double check). They do a daily lunch special with food of the day Mon-Fri for COP10000, Sat for COP12000. They are open only until 3pm I believe. For that you get a drink, a soup, main meal (usually some grains, a salad and a variation on a pulse/bean/vegetable dish - and it changes), and a tiny dessert to finish off (which was very yummy and plenty big enough as the rest of the meal was very filling). The food tastes fresh and homely, nothing exceptional in terms of flavour of gourmet (it's a no-frills kind of place), but a very decent meal that I would completely recommend (especially if you want a break from the regular Colombian 'lunches' that are around and always feel quite unhealthy/heavy/fatty - and of course meaty).
And although tiny, the decor is cute and it feels like a nice place to sit to eat. I'm not sure if they have an a la carte menu also (according to the pictures of this listing they must have although I dind't see any burgers - but try the lunch of the day, it's really good.