We really enjoyed our stay at Emilio's apartment. The location is great, just steps the many restaurants of Barrio Lastarria, and the apartment is clean and modern. It is a very comfortable home base for exploring Santiago - walking distance to a lot of attractions and parks, and a short subway or taxi to other places such as Costanera.
Emilio was an amazing host. He was able to arrange an airport pickup for us, accommodate our early check in, and provided an extensive list of tips and things to do (in English, nonetheless!). He also checked in on us several times to make sure we were doing OK.
The only flipside to the location is that there can be noise from the restaurants below the apartment, and we found it a little loud the first evening. However, from the second night on we turned on the fan in the master bedroom and it drowned out all the noise and allowed for great sleep.
We really loved our stay at this apartment and would definitely stay here again!