My mom and I loved our stay at the Villa Douce - it is exactly as pictured, with airy, clean rooms and super comfortable beds. We didn't use the air conditioning that much because it was so nice to have the windows open with the breeze, but they are effective and easy to use. Between the hairdryer, iron, washing machine and dishwasher one has all the amenities you could wish for.The kitchen is also well stocked with utensils etc. if you want to whip up a meal - although it's hard to get motivated since the restaurants in Martinique are so great! However, we did love eating breakfast out on the wraparound porch while enjoying the amazing view of the valley and ocean below.
The house is in a great area, and is reasonably close to the marina with grocery store, restaurants, and shopping. There are tons of beautiful beaches nearby too - our favorites were Grand Anse des Salines, Grande Anse d'Arlets, and Cap Chevalier - but I'm sure any you go to will be amazing!
Most importantly, Guilhem was an excellent host - he was easy to communicate with before our stay, and patiently answered my (long) list of questions. Since we were arriving on the late side he made dinner reservations for us, and even showed us how to get to the restaurant after meeting us at the house. During our stay, he continued to be responsive to any of our questions/concerns, and went out of his way to bring us a beach umbrella.
I would suggest - if possible - renting a four-wheel drive vehicle when staying at this property. In addition to a very steep hill on one of the approaches to the house, the road the house itself is actually on is a bit steep and lined with largish rocks. We were able to pick our way along it with a regular sedan, but it was a bit stressful (especially when worrying about not damaging a rental car).