This is a perfect place for an individual traveller, though simple. Excellent shower, very clean, comfortable bed.
Some street noise may be heard, but who cares? After all, you are in the very center of Donostia and also close to the beach.
Getting the room reserved and getting acces to the room via extended digital procedures will not scare off tech-savy people, I felt a bit nervous about it however, which has more to do with my not very up-to-date devices. Eventually everything worked out impeccably well and the host was always reachable on the phone for explanations and info.
Bottom line: excelllent place!