Great space, great location, great communication, flawless checking.
The thing that was not very good was the cleanliness aspect.
The bathroom does not look to have been cleaned in a very long time.
The kitchen very similar cleanliness issues. The refrigerator etc.
AirBnb hosts are provided the ability to charge for cleaning fees.
Cleaning can be obtained quite cheaply. Perhaps raising the fee slightly and having the apartment professionally cleaned between stays is the answer. It cannot be solely left to the guests staying in the space.
A second/third fan for the bedrooms might be useful. It does get very hot and this is a beautiful old apartment, but without air conditioning. Santiago summers are hot.