Here is a link directly to the hotel at the lighthouse in Finisterre.
http://www.hotelsemaforodefisterra.com/en/
It is obviously more expensive and MUCH nicer than probably any place you will have stayed while walking, but it is the loveliest treat to yourself after trekking it across the country. I had the best night of sleep on the most comfy bed and woke up to the lighthouse directly out my hotel room window.
It is at the top of the hill and at the official 0KM marker which is really special. There is also a guy near the marker that gives what would truly be the LAST stamp if you make Finisterre your final destination.
I would highly recommend treating yourself with a special final night at Hotel Semaforo de Fisterra.
Buen Camino, Merethe!