Carlos' place was easy to find and even easier to get into. We never met him but he responded to our messages promptly.
We came in a little early and the maid let us drop off our things while she finished getting it ready.
The place is much bigger than the pictures and you can't hear any road noises. You can only hear the neighbors talking once in a while but it's not a problem. The place is spacious, clean and comfortable.
Used Uber the whole time we stayed so not even sure how far the Metro is. There is a decent supermarket about 30 feet away and a small shop about 5 feet.
Make sure you check out Mercado Roma for some awesome eats and for sure try the churros at El-Moro.
Walked around during the day and early evening and never had a problem.