I stayed a full week at Idoia's place in October 2022. I had a really good stay as the room is quiet and comfortable with TV, Netflix, Fridge and a nice bed. The flat is located not too far from the Casco Viejo which you can walk (15 mins) to or take the metro (on the way back from Casco Viejo to the flat better to take the metro if you don't want to climb up the hill. Alternatively if you want to walk you can take the route via the escalator).
The area is okay with various supermarkets and bars.
The kitchen can be used and there is everything you would need, including washing machine.