I stayed at Solange's place for 3 days and she was a great host right from the start. She was communicating with me constantly before my trip and was very kind and helpful to allow an early check-in as well. Her apartment is nice and tidy. Alcantara metro station is a 10-minute walk, grocery store and restaurants close by, and a great view of the mountains.
It is excellently located in a beautiful area in Las Condes. We were tired every day and fell asleep as soon as we got back to the apartment, but if you are a light sleeper, then the constant noise from the street might be an issue for you. It's not a big deal if you don't have light sleep.
I would highly recommend Solange's place for a stay in Santiago.