It's a 10th floor loft about two blocks from the subway in Recoleta. Overall, I'd recommend the place if you're ok paying a premium for the open loft.
I stayed here a week and mostly enjoyed the place. The location is good. The bed and pillows are very comfortable. The bathroom is ok but the sink is small and shower is pretty hard to get the temperature right (goes ice or fire easily). There are some homeless people sleeping in the small park and sidewalk just outside the building, but I'd add the building seems extremely secure. There's moderate street noise and barking dogs, and one night some annoying repetitive sound from the neighbors (I think it's another AirBnB).
Internet didn't work well in the bedroom area for me, which was surprising because it's good downstairs. The balcony is small, just enough to stand outside.
Check-in was by lock box. The host was very nice and always quick to respond.