If you are debating whether to stay here or somewhere else, pick this place! I cannot emphasize enough how sweet and friendly the hosts are.
They were very respectful of our privacy, but they were also around to help us out when needed. For example, Antonio called us a taxi to the airport at the end of our stay.
But even before I booked the stay, he was very kind and had quick responses. He was able to block off my dates for a week while I waited for my vacation request to be approved at work.
Once I booked it, he gave very clear directions on how to get to their place.
Once we arrived, check-in was very smooth and he went over many brochures and maps to tell us all we could do in and around Bilbao for our one-week stay. He really knows the city inside and out and so if he tells you to check out the library, do it! It's beautiful.
Unlike dozens of Airbnbs we have stayed at, they provided some breakfast cereals, cake, milk, tea, coffee, water and fruits. These were replaced as needed. They even replaced our towels half way through the week!
The room itself is very dark at night and quiet. The sheets were clean and comfy. We slept well and deeply. The bathroom is right outside the bedroom and, as others have noted, is very clean. There was always hot water when we needed it. Plenty of toilet paper, shampoo and bath gel as well.
Location is superb. We walked everywhere easily, and within a two minute walk, you are in the heart of the town. Bilbao is not a big city and with a metro station nearby, everything was within reach (the metro goes to the main bus terminal that took us to San Sebastian and Vitoria for the day). We also took a day trip to Guernica on the train.
We don't know Spanish, but we were able to communicate just fine as Antonio's English is much better he thinks.
We feel lucky to have stayed here. We would stay here again in a heartbeat, as this place is amazing value! I would highly recommend this pace to friends and family.