Josune's place is a great value and a wonderful place to stay to get to know the city of Bilbao. One extra special benefit is if you have a car, the garage is secure and not far away. We made a couple of day trips to places not too far away (Pamplona, San Sebastián) and having the car and the parking was great for that. The flat is not too far from the city center and most of the main sites.
Josune was terrific at communicating with us. We were never in the dark about any aspect of our trip.
Lastly, the apartment was well taken care of and very comfortable. The kitchen was well stocked with necessary appliances and utensils. There are also markets and panaderias near by if you wanted to buy some food.
Would highly recommend staying at this apartment!