The apartment is fantastically well situated near the South end of the main beach and looking out directly over the town square and bandstand from a Juliet balcony. While we were visiting in late July this meant that there was nightly live music playing which we very much enjoyed. Normally the music was finished by 11pm, but on one night (festival of the flaming bull!) it went on later. There are plenty of restaurants nearby and the train station is less than a 10 minute walk.
The apartment itself is nicely furnished, we didn't use the sofa bed only the two main bedrooms which were comfortable. The kitchen was straightforward with everything you'd need (except a kettle).
We stayed with 2 children one of whom is 3 years old, and found the apartment perfectly safe although we did move the more vulnerable looking ornaments out of the way during our stay, and closed the shutters on the Juliet balcony at night.
All in all a really great place to stay to enjoy St Jean de Luz, we would happily stay again.