Smallish appartement but big enough for a family of 4. Great location right on the beach. Note that because it’s right at the beachfront you have the noise of the bars at night (but only if you leave the windows open otherwise the appartement is really well insulated). Well equipped with all you need in the kitchen. The interaction with Myriam and her husband was pleasant and straightforward (they live downstairs).
Definite recommendation if you want to stay in Hendaye!