Nothing fancy, but it doesn't have to be. Take a seat outside in "el Codo" or climb the stairs to the surprisingly large, New Age-y sort of dining area. Crepes are easily the best I've had in Aguascalientes and the smoothies--especially the guava and yogurt one--are to die for.
Service is pretty much standard for this kind of place, unaffected but pleasant enough teenagers. Drink/smoothie prices are perhaps a little high but worth it for the quality, while food prices are surprisingly low even compared to lower-quality crepes around town! Definitely recommended.