We had a wonderful stay in San Sebastián and Mikel was an outstanding host! First, he is very responsive to all questions and provided a lot of great information on the area both before and during our stay (in several languages). Not only did Mikel meet us at the apartment, help carry our luggage up and walk us through everything, but he also arranged for a parking spot at an economical garage and then went with my husband to show him where it was (we paid). We had some questions on the WIFI and Mikel was very responsive during our stay so we could stay connected.
The apartment is in a great location with many of San Sebastian's restaurants, shops and sites close by. We rented bikes (around the corner) and used these to get around during the day; in the evenings, we were able to walk everywhere we planned to go. The apartment, while in an older building, is very clean and modern. Just about all the amenities we needed were there - including laundry detergent (I had brought some just in case). If you plan on spending time at the beach, I recommend bringing your own beach towels (apartment did not have these), but we had planned for this, so it was not an issue.
We loved the town of San Sebastian and having the comforts of an apartment and Mikel and Ainhoa's hospitality was very much appreciated.