A huge apartment in a beautiful building. Two big bedrooms with bags of space, all the amenities you might need - and great views from the (narrow) balcony. We were travelling with our 18-month-old baby and the place is pretty child-proof, so it was a relaxing stay. Great communication and we were able to have a super-late checkout, which made our last day nice and chilled.
We also loved the location - five minutes from the beach, and five minutes from the central market, shopping and some really great restaurants.
Although there's no parking, we mostly parked our rental car just behind the building on Rue de Proutze. You can park there free overnight, and top the meter up for the morning. We also found free on-street parking about a 15-minute walk away from the coast.
Overall, we'd definitely rent here on any return to Biarritz.