The apartment is very stylish and has a nice size, even for an extended stay. There is a really nice cafe really close by (Olaeta) that is a great choice for breakfast and even a small climbing garden under a bridge on the way to the cafe that was perfect for our six-year old. Overall we had a nice stay, but there are three things I would still prepare others who would like to stay in this apartment:
1) finding a parking spot can be a bit tricky in the evening, though Ainhoa & Javier also offered us their space in nearby parking garage.
2) it can get a bit loud in the apartment at night, both due to people outside the building (going out) and one man inside the building who does quite a bit of singing. There is absolutely nothing Ainhoa & Javier could do about this, but I would still recommend that light sleepers bring some earplugs with them.
3) The cleaning fee (50 euros) is a bit steep, particularly in our case, as we only stayed one night.
Nevertheless, we had a nice stay and Ainhoa and Javier did their best to accommodate us!