We stayed here for a week, as our basis to explore Andorra. It is a perfect location and Carles's property is a lovely, rustic apartment with all the facilities you might need.
Despite the heat outside, it was lovely and cool, given that it is in a shaded location and with thick walls that, I am sure, will guarantee keeping it warm in winter as well.
The apartment is well cared for, with all required mod coms. The wifi is a tad slow, but that seems a curse/blessing (delete whichever is most inappropriate)in the entire country, where there is also very little 3G (or even GPRS) reception anywhere. There is a well stocked Dia supermarket literally 5 minutes walk from the apartment. Perfect.
I would highly recommend this apartment and was very pleased with the interaction with Carles and Isacha before and during our stay!