I would never stay here again.
The apartment is right above a great, but loud restaurant called Chipe Libre. Chipe plays music until 2 AM all but one day a week and early in the morning on the weekends. You are going to hear it since the walls of the apartment are so thin.
There are no blackout curtains in the apartment, so you'll start your day bright and early whether you like it or not.
If it's cold in Chile, you're going to be cold in this room. If it's hot in Chile, you'll be hot in this room. It's very poorly insulated.
Hot showers will either be scaldingly hot or spotty. In order to get the hot water working, you turn on the gas tank, let the skin run and then play with the faucet until it's just right. The gas-fueled flame will then flicker out and you have to start all over again.
On top of all these objectively valid statements, you are not in luck with the host. She lived in this apartment for years. So, since she never had problems in the apartment it's expected that you won't either. When you bring up an issue or ask for help you're basically told that's your problem, because she never had such an issue.
Seriously consider your options before booking this room.