Great place to stay - the apartment, and the barrio Lastarria!
We spent one month in this apartment (2 adults, 1 child). Although it is not very big, we felt very comfortable there and enjoyed our stay. The beds are comfortable, two separate bathrooms are very helpful, and everything is there to provide for your own meals (2 supermarkets and the metro station nearby). The view from the living room is spectacular. The barrio is wonderful, a bit like Hamburg Schanze.
Nicolas left us the keys and was a very kind, responsive and flexible host. We can certainly recommend Nicolas and his apartment, for a short or a long stay!