I didn't use any filters. I typed Concepción and then moved the map left a bit so that it showed the Universidad de Desarrollo, to find your listing.
Just now I tried again with dates of the 1st to the 3rd of March, private room filter and instant book filter and your listing showed up when I moved the map a bit to the left.
Thanks again Steve but there is something strange about it. For the last month I would enter airbnb's site just inputting the name of my city and it would show up right away. Now it is not doing it. Another thing that puzzles me is why do you have to move the map to show my listing??? Isn't it kind of burdensome ??.