A nice little place at San Martin street. It is closed by to the main shopping area, and there are lots of amenities nearby (such as supermarkets and bakeries). The place is rather secure with two layers of doors at the entrance, and it is quiet at night, so you will definitely get a good night's rest.
Adriana also personally arranged with me to have a very late check-in due to my flight arriving only at night, and allowed me to check out later at 12pm instead. She is a very nice host and replies fast on WhatsApp, and tries her best to answer any queries that you may have.
If you are looking for a place around the area, just arrange with her to stay at her place!