I love a good love story and Nieves Herrero, a Spanish journalist and writer, has certainly given me a few good ones, but her latest book “Esos días azules” (“Those blue days”, in English) has touched my heart in a very special way. A meeting of souls As her other novels, it is based on a true love story, that of the famous Spanish poet Antonio Machado and his muse, whom he called Guiomar. Long after his death (in …