Great apartment - definitely recommend if you're planning a long stay in Santiago.
Pros:
Good working spaces
Tiny but very clean, very well stocked kitchen
Comfortable bed
Overall cleanliness
Water heater works well and shower pressure is good
Internet is realiable
Host is nice and always ready to help with whaterver you may need
Cons:
I wouldn't really list this as a con, since the host was upfront about how internet speed was quite subpar when compared to the Chilean reality. However, I was quite surprised about how well it behaved. Sure, it's not the fastest in the world, and sometimes you would loose connection for about a minute or so, but it was still enough for both me and my wife as we both work from home doing video and voice calls. Just buy a SIM Card as a plan B and you'll be ok (avoid Movistar though, their connection is not very realiable for calls).