We arrived at the apartment 1 hour in advance, we called Arantza and within 10 minutes somebody was there to welcome us.
The apartment was clean, and fitted the pictures. The beds are good and WIFI connection is excellent.
It is in the old town with nice shops and restaurants nearby, plus the metro is on 5 minutes walking distance.
If I go back to Bilbao I will for sure stay at the same place.

The communication with Arantza was good and to the point. She also ordered a taxi for us early morning, to go to the airport.