If you want to sleep in Zumaya, the Hotel Flysch is a really good option. It is a new hotel. It offers 16 rooms and 2 lofts with its own kitchen. The hotel was designed by the Basque artist Anton Eguiguren. This gives an explanation to the strong personality of each room. The rooms have views to the flysch of Zumaia.
Another good option to sleep in Zumaya is the Hotel Talasoterapia Zelai. This hotel has 26 simple rooms with a minimalist and plain decoration. Some of the rooms have views to the ocean. Try to book one of those rooms because they are prettier. In this hotel you will have a wide treatment offer. It has a spa service with wide facilities such as its saltwater pool, steam baths or whirlpool baths. Its restaurant is grazed and it has views to the Zumaya cliffs.
We also recommend the apartamentos Izarraitz de Basque Stay. This accommodation is less than 10 minutes away of the beach. It is a complete apartment with kitchen, bunk bed and queen size bed. It also has a comfortable terrace. It is located in an old building but the apartment is so modern so you will be pleasantly surprised.