The Marrakech medina is in some ways a trip back in time, but this is also a living, evolving city — perhaps nowhere more so than Mouassine, the corner of the medina that’s home to Riad Sakkan. This is the glamorous, youthful, fashionable side of Marrakech, which explains why Riad Sakkan is, in contrast with most other riad hotels, so strikingly contemporary. It’s a traditional inward-facing courtyard house, yes, but one with a contemporary color palette, modern furniture, and bedrooms…