That’s Casa Museo de Unamuno as in Unamuno House Museum, and it’s the Puerto del Rosario version rather than the Salamanca one. Miguel de Unamuno y Jugo, to give him his full name, was a Spaniard of many talents. In his time, he wrote plays, poems, and novels, and was also a highly-regarded philosopher.
Exiled by Spanish dictator Miguel Primo de Rivera from his position as Rector of the University of Salamanca in 1924, he resided first in Fuerteventura. And this is the house where he lived.