I loved my stay at Maria and Pierre's apartment! The location in Gros is absolutely amazing right in the middle of all the action of San Sebastian. I had easy access to bars & restaurants, the beach, old town, and more. It's definitely where the locals live and hang out. Nothing against Old Town, but Gros has a more authentic feel. Maria and Pierre also have some pintxo recommendations for some pretty awesome places that I recommend checking out.
The private bathroom is an added benefit. It was great that I didn't have to leave my room to use it. The apartment is also very clean and the bed is comfortable. I'd definitely recommend staying here!