I'm a hotel snob so spent lots of time looking for a good riad in Marrakech before settling on Riad Clementine. My wife and I were driving around Morocco and wanted to treat ourselves and this riad was the perfect place. The aesthetic is calm and refreshing compared to some other riads that are perhaps truer to historic form but go a bit overboard on mosaics and pillows. The riad is owned by a couple, Antoine and Angela, who were extremely friendly and helpful.
Our room and the bathroom was very nice. The pool and terraces with loungers were a great addition and one of the reasons I picked the riad -- after walking around the souks it was great to come back for a dip in the pool.
It's also got a great location: while it's in the medina it is only a couple blocks from the medina walls, so it was an easy, 15-minute walk into the Ville Nouvelle area of Marrakech. We'd explore the medina during the day and then head into the Ville Nouvelle in the evening for a different atmosphere.