Mikel was a very friendly host and left us with food in the apartment for breakfast and basics for other cooking. He gave us recommendations for places nearby and responded to all our questions really quickly.
The apartment itself was great - comfortable for 3 people or a couple. The view from the terrace is really nice - great to watch surfers from. It's a quiet neighbourhood just under a 10 minute walk from the old town. There's plenty of nice places nearby to eat or drink, and the beach is literally a minute away. I would happily recommend it as a place to stay and explore San Sebastian or just to chill and enjoy the beach.