If its your first time in the city I am sure that its impossible to be in a better location / apartment. The view to Zurriola Beach (In Gros) is outstanding, just a block away from Mercado Bretxa where you can buy all the food you need and just a couples of blocks away from all the Tapas/Pintxos Bars - Restaurants is impossible to match.
If staying in a truly clean and nice decor place is important for you then this is a good place to be, it exceeded my expectations. I stayed there because my hobby is cooking and I enrolled in a month long course at Basque Culinary Center.
The only thing I would suggest is to be able to have a web or PDF with suggestions of things to do in the city.