We had a great time. It was just right for us. The location is great. The weather was not too hot and not too cold. The two towns (Quend Plage and FortMahon) are very close. Fort mahon only a 10 minute walk. It has a good fresh markte every Tues. and Fri. The accomodation was comfortable. The kitchen had everything we needed (ceramic stove). There were dishes enough (because laid out for up to 10 or so, there were enough plates, cutlery, utensils, and pots and pans to not have to wash all the time. And the matrasses were good.
I can only speak for our unit (34 - beside the golf course putting practice) and the time from early to mid June. We read some not so good reviews, but for us this was a very comfortable great stay.
The Henson horse riding in the dunes is well worth it. We rented bicyles. And we took part in the bow and arrow shototing.