The place was fine, but not 5 stars great. There was a bit of mildew in the tubs, for instance, and the floors had a bit of sand/dirt on them. The vacuum cleaner didn't work well, which is probably why, and one of the sink's stoppers didn't work. I have 2 small children, and they're not the cleanest in the world, so they didn't care of course, and it wasn't a concern.
The apartment is in the top floor, and there were loud parties on the roof every weekend and some weeknights... This included very loud music til 3-4 am, and lots of stomping on the roof. I was in Santiago to work, and with a baby and a small kid, already don't sleep enough, so that was non-ideal. There is also constant noise from the street (even with the windows closed, and even though it's 28 stories above Américo Vespucio).
Las Condes is nice, though, with a few nice parks for the kids, and the sushi downstairs is pretty okay.
The views of the sunset and sunrise over the mountains were pretty spectacular.