Overall not a bad experience.
The good things: The host's communication is excellent: during the period of inquiries, similarly after the reservation and during the stay. It is really 5 star.
It is a new and clean building. The the ice cold swimming pool on the top floor presents a great, relaxing environment and a view. If you are ambitious, you may swim.
Negatives: being a very new building, a lot of moves, furniture delivery, drilling and noise during the day. Not ideal if you need to work from "home". Windows face into a direction of one of the busiest avenida's of Santiago (Apoquindo) with constant noise of traffic, which even the double glazed windows are unable to properly filter. I don't recommend to open the windows/sliding doors, unless you like noise. Full exposure to sun in the afternoon. Despite of the A/C, the small living room gets very hot and it is just springtime. Air ventilation and duct system is a the building is poor: smoke of cigarettes coming from the neighbours can be felt inside the apartment.
The buildingnand the neighbourhood appeared to be safe, but lacked character. I found the price high compared to the value I got.
I'd be happy to stay at this host's other listings (but not this one) in the future, as the customer service was excellent.