First, we met Maria de Jesus at the apartment and she is an absolute sweetheart! Her English isn't the best (but much better than my Spanish) but she was able to communicate everything just fine. If I had to try and provide something negative I guess it would only be that the place is a little difficult to find...especially if you are not familiar with San Sebastian and you are driving a rental car. That said we were able to find it and Maria met us at the door. The location is great...only maybe a 5 minute walk to the beach and plenty of restaurants and bars in the neighborhood. The apartment is small and basic with everything you need. As advertised, it has been recently remodeled and there is good water pressure. It is perfect for a couple. On our second night night we had a friend stay with us and she stayed on the pullout sofa (which is pretty new). Three was fine, and I think four people would definitely be max.
Pretty much all the communication you would do online/email/text is handled by Maria's son as he is fluent in English. He was very responsive and usually replied within a couple of minutes.
All in all, great place, great location, great experience...Highly recommend!!!