Highly recommended. First off, communication with Marcela was flawless: coordinating my check-in was extra-simple even when I didn't have visibility on my arrival time until very close to my first day of stay. When I got to the apartment, I met Ximena. She showed me the apartment around and, yes, welcomed me with breakfast (she had been to the market to get some milk, eggs, bread, etc. right before meeting me). Ximena rocks.
As to the place itself: clean, tidy, stylish. Perfect for one, or a couple. It has everything you would need. There's even shoe polish. Wi-Fi worked so well I never thought about it until now I'm writing this review.
The neighborhood, residential but very close to highly rated restaurants in Santiago. You have a metro station Alcántara just meters away.
I will come back next time I visit Santiago.