In general, we really liked the apartament. We only met Dominick, who is an amazing host. He was very helpful with suggestions, and there were a bunch of useful information on a book they left in the apartment. He was also very quick to respond us when we needed.
The location is amazing, we were at walking distance from most of the attractions of Santiago(for example: Cerro San Cristobal, Cerro Santa Lucia, Plaza de Armas, Palacio la Moneda). Also very close to Patio Bellavista and Lastarria, with lots of dining options. There were also grocery stores and subway stations very close.
The apartment was nice, a lot of room for two people, a nice kitchen with all the basics and the bed was incredibly confortable, with warm blankets(wich were much needed in the winter).
The only downside was the heater, wich was gas fueled. The sparkle didn't allways work, so i had trouble turning it on. We talked with Dominick and he told us to light it with matches, but i did not feel safe to do it, so i tried to avoid it. When we did light it, it did not warm the room enough, only if you stayed right in front of it. Because of that, our mornings were very cold.
Besides this, it was a great experience, and we would probanly return.