This is a really nice apartment, held by an accommodating host, Javier. It easily sleeps two and could be up to four with a pull out sofa bed. This is a clean and tidy space and close to amenities.
Getxo is about 25 minutes away from the centre of Bilbao, but easily accessible via the metro system. Algorta is probably the closest metro station (5 minutes), which is up a steep hill, although there are elevators to take you up if you find walking difficult. There are some nice bars in Algorta for snacks (pintxos).
The beach and the old fishing port is perhaps another five-ten minutes walk from Algorta with restaurants and more bars.
Madrid is about five hours on the train from Bilbao.