Stayed for a week at Riad Carina. Felt like home away from home. The staff really made me, as a solo traveller, feel welcomed. Especially Said who is working at night shift, who was always so friendly and kind to me. On the day of my departure he brought me gifts of Moroccan instrumental music cd and a keychain with traditional motif. I thought that was a very nice personal touch.
The room is nice and clean. I was there during the winter. My room got air condition that could serve as heater as well. So it was really nice and comfy during the night when the temp outside could be quite chilly.
The location of the hotel is good. 10-15 minutes from the main square. Closed to some of the main attractions; Bahia palace, Badi palace and Saadian tombs. The area feels generally less touristic that other areas in the medina.
I can definitely think of staying at the Riad again next time I come back to Marrakech.