We arrived by plane in Bilbao, took the bus right outside the door of the airport to San Sebastian, then another bus to Loyola. Very quick, easy and cheap.
We went to the small tourist office right in front of the basilica, asking about accommodations. She lamented that both the website -- caminoignaciano.org -- and the guidebook were 4 years out of date. I wrote a long message to Fr Jose Ibereri, the creator of the route, and Chris Lowner, the author of the guidebook, with all my corrections noted when I finished the walk.
Check with the tourist office, but be advised: There are only albergues in Loyola and Arantzazu, and the latter is 13 euros for a bed. There is supposed to be one in San Vincente de Arana but we never could find it. We stayed in pensiones and hotels enroute. In Zumarraga, a delightful town, a local man seeing we were pilgrims, took us first to the Pension Balentina, but it was closed. He then took us to the Pension Urola, which was very nice and also near the end of the city, so it was quick trip to the trail in the morning. The walk to Arantzazu is the toughest we have done on any of the 8 caminos we have walked. 4 hour steep uphill on a rocky trail followed by a 2000 ft steep, slippery downhill. We stayed in the albergue in Arantzazu which is lovely, 56 beds, no one there, free breakfast. But at 13 euros, overpriced. But everywhere else there is much more expensive. The next day's walk ranks as one of the most beautiful of any camino...period. We stayed in Alda at the Casa Rural Biltegi Exter. Wonderful communal meal that evening. The next day we took a short walk to stay in Genevilla. We splurged and stayed at the Casa Rural Usagietta, a five-star accommodation. If you can afford it, stay there. It was unforgettable. The next day we did the 28km walk to La Guardia, a drop dead gorgeous city...like Tuscany in Spain. We stayed at the Casa Rural Erletxe, in the heart of the old city. After that, you join the
Camino Frances at Navarette, where there are a number of albergues. Ditto for Logrono.
Buen camino!