I will describe things one by one.
1. Location
The apartment is situated extremely well right next to the beach of Port vieux. This beach in my opinion, is much better than the Grand Plage for families and couples, it is smaller, much less noisy and the waves are calmer than the Grand Plage. View of the sea front reception room and balcony is gorgeous.
10min walk to local market and Carrefour, 5min walk to main shopping area with Galerie Lafayette. Great location.
The only downside is the music that plays from the bar on the beach from 9pm to after midnight on most days, it wont be a problem if you go to bed late, but if like me, you are in bed at 11-12pm the latest, then it is annoying and you have to close all the windows and balcony to hear it less and then the room becomes a bit stuffy.
2. apartment
Very stylish, with lots of nice touches and decorations that are pleasant to the eye. Would be ideal for four people (eg two couples). New kitchen and showers, everything high standard. Very pleased.
We were welcomed very well, and all our questions were answered. Thank you for taking care of us.
If I were to come to Biarritz again, I would stay here again as I think it is a great location and apartment (will have to put up with the evening noise from the beach bar but i guess it is unavoidable if you want to live close to centre of city and on the beach) and I wouldnt find better, unless I become a millionaire and can afford the Hotel du Palais :)