Nice apartment, with everything you may need during a long stay. Probably what I liked the most was the convenience of having a big supermarket really close. You can cross the street, walk for one minute and you'll be in a supermarket where you should find everything you need.
The building is nice and has great security. It's located in a relatively quiet place. Far enough from main public transportation to be somewhat quiet, and still close enough to be convenient.
There's a small restaurant just across the street. Customers may get a bit loud at times, but not enough to be of much concern. Overall, it is a great option, nicely located in the heart of Santiago. And with a great host that will be attentive and quick to respond.