Super nice apartment with lots of space. We went with our two year old - baby safe and equipped with high chair as well as cot. Could have fit a bigger family easily. Clearly freshly renovated and very nicely done ! Some kitchen basics (coffee!!) and two big bottles of water in the fridge were a nice touch at arrival.
There is a nice bakery just downstairs in the building, you can park for free at 5mins walk ("Diario Vasco" parking lot) and at 5mins heading towards beach there are some nice squares with great restaurants / bars if you don't want to do the pintxo madness every night :) (try Bar Lobo or Mandragura next to each other at Jose Maria Sert Plaza). In 10mins walking you are at Kontxa or Ondaretta beach.