Jose was a wonderful host and let us board his boat earlier than planned. He was not concerned what time we should vacate next day and we left around mid day.
It was a unique way to stay overnight in Bilbao and as we were meeting friends on a visiting cruise ship at the cruise terminal, we could not be staying anywhere closer.
The weather was pretty windy and gusty so the boat was bobbing quite a lot but this was not a problem and probably helped us drop off to sleep.
I would highly recommend staying on Jose's boat