Let me start off by saying that having to walk up the stairs is definitely worth it.
We absolutely enjoyed our stay in Mati & Santi’s place. The loft is amazing. The place itself in a safe and perfect location. Very clean & comfy.
You have a Costco down the street (which you can use your US Costco membership btw), and an entire shopping plaza with familiar American food.
As for safety, the neighborhood has security guards taking notes of all vehicles coming in and out on all exits. So if safety is of a major concern for you, know that the place is vigilant at all times. ☺️
We walked past midnight around the neighborhood and never felt unsafe at any minute.