We really enjoyed the space of the apartment, it was neat and lovely decorated. We felt at home for a week. It was also nice to have breakfast outside in the garden. The only problem we had was the parking. Since we travelled a lot by car it was stressful everytime we came back home, but we knew this in advance from the other reviews.
If you travel around Bilbao by public transport this is a great apartment to stay. It is a bit out of the city centre but the metro stop in front of the door will take you there easily (last ones go at 23:30). There are also escalators to get back up the hill to the apartment, during the week they are turned of at midnight. Unfortunately we were always back home to late and had to walk, our calves are still sore :)