Very charming place in a perfect location. We stayed at this flat for four nights while visiting Bilbao. It’s a few blocks from a metro station and the Guggenheim Museum. There are cafes and grocery stores all around it, it’s very convenient. You also have both the airport and bus stations within a 10 minute drive/bus or metro.
If you want to visit Casco Viejo while in Bilbao, this place is nearby, you can either walk to it next to the beautiful canal (about 20 mins), or you can take the light train or metro. It’s in a residential street, so you’ll get good and quiet sleep. The apartment is also very spacious and it has all the things you might need such as a kitchen, washer/dryer, two full bathrooms, etc.