Brian and Pablo's place is beautiful, comfortable and tastefully decorated, very well located near the subway, with a really ample balcony and a great view of Las Condes (8th floor). The building is modern and full of amenities. At night it's generally silent. As apartments go, this one is on the smaller side.
Keep in mind that Santiago is hot in the summers, and portable A/C is only available in the bedroom. Luckily the apartment has a southern view and only gets direct sunlight in the balcony.
For a long stay you might want to bring extra kitchenware, spices and utensils, as the apartment feels optimized for short stays and eating out.
Pablo and Brian were always nice and willing to help.