We had a fantastic time at Julie's place. It is a really big flat in the «hypercentre», so you can visit all Biarritz without having to drive along. The flat is well supplied, with natural light and big rooms. One flight of stairs to get to the appartment. Although the building is old, Julie's flat is renovated and well maintained. There is a wine bar right under the flat but, fortunately, customers were not noisy and the 'late Friday night' ended up quite early :), so this was not an issue.
In the street next to Gambetta, parallel to the right, we found free parking space in low season, so this was also great. A superb boulangerie across the street, lots of charm, elegance and style around, very good cafés, restaurants (dog friendly), shops and lovely landscapes. We recommend having lunch at Manatee and Le Tavernier, both places with excellent cuisine and reasonable prices, and visiting Les Halles, the local indoor market with fresh produce. There is also a Carrefour supermarket 200 m away and the beach is just 300 or 400 m away, so everything is at hand.
Julie and Theo were fantastic hosts, always available and extremely polite. We recommend their place and will surely come back in the future.