We were a family of three staying in Bergara 16 for a month. We loved the apartment because it had everything we needed for a comfortable stay: well-equipped kitchen, three bedrooms, plenty of closet space, and air conditioning in literally every room. The location is very central and you can get to La Concha in 5-10 minutes and Zurriola in about 10 minutes. There's plenty of grocery and dining nearby, so you can stock up on chorizo, pan, and tomatoes as you desire. The home itself is very bright and when you open the windows, the breeze will roll through and bring the outside indoors. Except for the very hottest of days, you probably won't even need the AC.
The apartment felt like a home compared to other AirBnBs which are more like... a place to stay. It's important to "feel" like you're at home to relax and enjoy the trip. We'd absolutely stay here again and with Jaione in general if Bergara isn't available.