The apartment is very central, 10 min walk from plaza de armas, but also the Metro is 5 min away. It is clean and comfortable, and Maria is very friendly and helpful.
It is a bit noisy by night because of the traffic around, but this did not bother us.
The internet works very well, so the apartment is also good for long stays and remote working.
There is also a supermarket right under the building, and plenty of bars and restaurants near by.
The building also has laundry and dryer.
Maria was also very sweet and let us stay until 5pm next day because we had a late flight from Santiago.
I recommend staying at Maria's place.