Rosalind Williams moved to Madrid from San Francisco, California over 40 years ago. She and her husband, who are daredevil real estate investors, bought a three-store building in the center of Madrid and, after living in it as a family home until their son left, converted two floors into rental apartments for short-term stays in the city. They've had visitors from all over the world, such as South Africa, Australia, Mexico, Israel and around the US. See the video to find out more. Less