No frills, real deal, server's-first-language-is-for-sure-Spanish kinda place. Picnic table seating, traditional Colombian decor, spelling mistakes on the bleached-out laminated menu...you get the picture.
If none of that turns you off, then there is great food to be had at Arrieros. Fresh soft shell tacos with fish, beef or Al Pastor are all great. Home-made chips, salsa and guacamole are the real deal. Imported "Colombiana" soda (kinda like Coca Cola) and charming staff are all part of what make this local hole-in-the-wall worth checking out.
I will say that food here is a little pricey for what you get but still somewhere I'd keep visiting once in a while.