If you're looking for an easy, simple place to stay in San Sebastian, this is a great value. The host is super friendly, and very responsive. A very budget-friendly option.
It looks nicer in the pictures, and definitely feels "lived-in". So, if you're expecting pristine and hotel-like, perhaps book a hotel.
But again, it's budget-friendly, the host is wonderful, and it serves it's purpose for a clean place to sleep.