Lysias place was located perfectly, 10min walk from the city center and main beach. The apartment was clean, the bed was really comfortable. There was 1 bedroom with a double-bed for 2 and a couch in the living room for 1-2 other people. We were able to use the washer, which was nice too. The only thing I can point out - we are both 1.85m+ in height, and the apartments ceiling were quiet low. Gotta be careful not to hit your heads! 2 days of crouched walking was endurable, any more would have been annoying.
Other than that the place was fantastic, great value to stay in Biarritz!