A lovely place to stay in a lovely city. Not quite in the main tourist area, but it's so easy to get around Bilbao that wasn't a problem. Just opposite a supermarket that had everything we needed.
Only a few downsides:
1. There's no heating or cooling - so you are quite dependent on air flow through the windows which can mean noise from the other apartments, etc.
2. While the apartment is very lovely, the beds need improvement. Better mattresses/pillows. The sofa is comfier than the beds!