Overall, our stay was very enjoyable. As described, Josefina's location is very central, within walking distance to many of BA attractions as well as shops/restaurants/laundry. This was most important to us.
There was a brief but strong thunderstorm during our stay on a Sunday that resulted in a power outage in the building for about 24hrs. The room had a flashlight and Josefina was extremely kind and responsive the entire time, providing anything in her ability to help us out, even offering dinner at her other residency.
The weather was sunny, warm with a nice breeze, but I don't recommend leaving the windows/balcony open as the mosquitos can become a problem. The air conditioning worked great.