We shared Hugue's place with another couple during a three day stay. The location is absolutely fantastic, with its incredible view of Cadaqués harbor from the terraces. When we were in the house, we spent almost all of our time on the upper terrace. If you're an early riser, watching the sun rise over the Mediterranean should not be missed. In fact, even if you're not an early riser, do yourself a favor and get up early to take in the stunning view.
I'll also note what others have mentioned: the kitchen is small but well equipped and serviceable; there is no wifi in the duplex so you need to plan your internet use around your trips to the town center; according to our friends, the beds in the downstairs bedroom were extremely uncomfortable, for adults anyway; and the various levels in the interior would make it challenging for toddlers if you're traveling with small children.
On balance though, it is a great place from which to explore Cadaqués. I would definitely recommend staying here.