Martxelo’s apartment is comfortable and calming, and situated in lovely quiet, modern part of San Sebastián. There are plenty of good local cafe’s (check out Trikua near-by) and food/beer (try Bar Mogambo). The no. 5 bus provides a very regular connection into the Centre, you can purchase good value bus tickets at the Tourist Information office in the Centre, and the d-bus app is highly recommended for planning journeys around the city.
All in all - highly recommended.