Ah, I was at number 5 Arte Vegetal just yesterday buying some chocolate, cheese, sausages and my lunch. It's not a restaurant but a little shop, it was doing some brisk business yesterday, perhaps as I dropped in at lunch time and there seemed to be a lot of office workers around. I'll try and go in a quieter time on the next visit, I like to speak to the guy who works there for 5 minutes when I go in, as he is the only vegan I have had a meaningful conversation with in person since I became (mostly) vegan. Every product in the shop is vegan, which is nice, not having to ask or read ingredients or whatever. Only place I've found where that is true. The sausages say on the packet that they are something like 70% or 80% protein, which is the proteiny food I've ever heard of.
Number 16 the Vegan Bunker I can recommend if you are in Santiago, although it's mostly in the middle of nowhere.
Santiago is an hour away though, I would not go that far for a restaurant though, I would spend at least £10 on petrol and toll roads and parking alone, and all of those restaurants are in Santiago. Although I do eat at places like that very occasionally if I am in Santiago anyway. Any big city anywhere in the world is going to have vegan or at least vegetarian restaurants, but in Latin America you are going to be much more restricted in a smaller town.