We stayed at Allande's place for a week in August and loved it ! The apartment is close to everything : beach, market, shopping, restaurants etc...
The apartment is fairly big, perfect for our family of 4. It is also located on the ground floor which was ideal to manoeuvre our stroller in and out of the apartment.
The apartment was spotless, the kitchen was fully equipped and all appliances were great (induction cooker !)
Overall we would definitely recommend staying at Allande's place to anyone visiting St Jean de Luz.