We had a lovely stay at Joseba's place. The apartment is just as it appears in the photos and has been renovated recently. One huge plus for us was that it is a ground floor apartment - we arrived on an unseasonably hot day for the Basque Country and the temperature in the apartment was as cool as if there were air conditioning (something you very rarely find anywhere in this part of Spain)! So we slept really well despite the heat. The apartment is a quick walk to the Casco Viejo, although people with mobility issues should be aware that it requires descending a ton of stairs (in other words, you need to CLIMB a lot of stairs to get back!). Not a big deal for us though, since we were happy to get the exercise.
Joseba was a great host! He was very communicative and check-in was easy (despite the fact that it's kind of confusing to figure out how to access the property, as there is a gate that he needs to lower for cars to get through). He also gave us lots of tips on where to get pinxos! We definitely recommend this AirBnB experience.