We are a family of 4 from New York, NY with family in Bilbao. We stayed for a random week (no local 'fiestas') from Friday - Friday. Communication with Arrantza impressed us very much. Her responses were friendly, professional, accommodating, reassuring, and timely. Arrantza's apartment was perfectly located on 1st floor of an elevator building in the Casco Viejo. It is a wonderful part of town but it can get noisy at night, particularly from Thursday through Saturday nights. The apartment was clean, organized and well appointed. Heat, lights and WiFi all worked well and the two bathrooms were very convenient. Some aspects of the kitchen need attending to, but stove-top, dishwasher and washing machine worked perfectly for us. Arrantza was very kind in stocking the refrigerator for us with some basics (milk, juice, soda) and making coffee, tea, sugar & salt available. There were cleaning supplies available (laundry detergent, dish washing liquid, sponge, paper towels, etc.) as well as bathroom supplies (hand soaps, body wash, shampoo, toilet paper, etc.). One issue for us was the main double bed was a bit too short even though we aren't very tall.
All in all, Arrantza is a wonderful hostess and the apartment served as a warm and comfortable home away from home.