We stayed as a family of 4 (two teenagers), we loved the location- perfect for beach and walking into the town. Over road is a small supermarket and nice restaurants/ bars very near.
Apartment is small, cosy and beds are comfortable (sofa bed downstairs can sleep 2 people). Small / shaded terrace to sit outside (enough room for 2 people only) and Wi-Fi is good (which pleased the teenagers).
Great for a beach / surfing holiday and lots of trendy shops and restaurants in Biarritz.