I have stayed in many Airbnb's, and Karen is by far the best host I have ever had. She was extremely accommodating during my entire stay, from organizing my check-in, to making sure I was always comfortable and had what I needed.
The apartment is beautiful and Barrio Italia is one of my favorite neighborhoods in Santiago, with lots of great coffee shops, bars and restaurants within walking distance of the apartment.
I would highly recommending staying with Karen, whether its for a short or long stay. You are sure to have a wonderful time!