Olivier's place is a gem on the most beautiful and historical square in Madrid. This is a full 5 stars to me. I was there on business landing early and Olivier opened the door very early for me, offering me coffee and helping me get set up for my day of work. He gave me some insights on where to walk around in Madrid, which showed me where to discover the local sights of Madrid. Loved it. Would advise it or go back anytime.