We stayed at Karin's place for a month and had great stay! We wondered if the place might feel small after while but it really didn't, because the apartment is really smartly organised and has all you need. It has plenty of storage, a great little living room area and kitchen (which even has a dishwasher), very comfortable bed and perfect shower. The patio area is a really nice bonus and the photos really don't do it justice.
The location is perfect, right in the centre of Biarritz (a few mins walk to Les Halles or the Côte des Basques beach) but very quiet nonetheless.
Finally, Karin is a great host, so easy to communicate with and extremely helpful. Thank you for a great stay, we highly recommend this place!