In one word, sublime.
The apartment was simply amazing. Brand new and very clean, elegant by combining modern and cycladic decoration, with all the amenities needed for an excellent stay in Naxos.
In my opinion, the apartment is more than ideal for a couple in the mood for romance, and/or for a family with a small child.
The location was just across the main port and the triple glazing windows were keeping out the summer island noise.
The breakfast/brunch option was a welcoming add-on with very good food.
Petros was an excellent host who helped with issues raised during our stay, immediately and efficiently. He seemed to be available 24/7. I was not sure when he had time to sleep!
We are recommending El Puerto 100%