Mercedes’ apartment was exactly as described and fitted us perfectly for our three day stay in Santiago. The bed is super comfy and big, and the shower really good and hot, we also enjoyed the sofa a lot! Mercedes has everything ready for you: tea and coffee as well as shampoo, soap and really nice towels.
The apartment is close to the center of Santiago so it was convenient to visit the sights. To nice and bohemian areas such as Bellavista you can also walk from there.
There is a road (fortunately not to the apartment side of the building) which can be a bit noisy in the morning. In the evenings the area around the apartment is a bit dark but we managed fine by getting back there by Uber or taxi.