There are many great reviews of Jose's apartment and they are all correct.
We expected the inside to be relatively small, because the terrace/balcony is so large, but the inside of the apartment is not small at all.
The shower was powerful and had very hot water throughout our 5 night stay.
The terrace/balcony does indeed have excellent views and is a great place to relax and/or sunbathe. During our stay in December, the terrace/balcony was in direct sun from around 8.00am to 8.30pm. There is an awning covering the seating area which provides shade when required. The apartment is on the 13th floor and so although the Santiago traffic can be heard from the terrace/balcony it is not loud, more like a comfortable "white noise" and not a distraction.
The Aircon within the apartment was very good and the bed was comfortable.
The pool on the top (16th?) floor was bigger than expected, very clean and relatively quiet despite our stay being over the Christmas period.
Jose was excellent at communicating both prior to and during our stay and graciously allowed us to check-in a little earlier than the stated time.
The area is up market and has some excellent restaurants: Baco Y Vino, Le Bistro de Gaeton and La Biferia are thoroughly recommended. De La Ostia is a Tapas place themed on Barcelona's Tapas Bars and has a great atmosphere. All of these restaurants are in easy walking distance of the apartment.
The Wifi was fast and constant throughout our stay.
We had a great time during our stay in the apartment and are already discussing staying there again, when we return to Chile for a further bird/mammal watching trip as our "luxury" at the end of the trip.
Thank you Jose!