If you go to Don Julio’s, get the provoleta de cabra.
It is one of the very few places that you can get provoleta made with goat’s milk vs cow milk and it’s much tastier, plus it is easier on the digestive tract.
I would also recommend getting a bife de chorizo (NY Strip). Don’t get the lomo (beef tenderloin), because it isn’t as tasty and it may even be too tender. Either the bife de chorizo or the ojo de bife (ribeye) are the only two steaks you should consider.
This used to be a locals spot until my friends (food bloggers & travel bloggers) started writing about it as a hidden gem and now it’s so packed (and probably more expensive) that it isn’t as much of as locals place as it used to be.
Also have heard that they open a little earlier than in the past (7pm?) to accommodate a seating of typical tourists before a second seating of seasoned travelers/ expats/ well-healed locals. Cannot verify.