We stayed only one night at riad Ghemza but we wished we would have stayed longer. The staff is very friendly. Breakfast are the best with fresh fruit and homemade yoghurt. It's located in the middle of the medina, very close to the museums and historical places. Very clean bedroom and nice and warm shower. They also have a very nice terrace where you can relax from the agitated life in the medina. The one tip we can give you is that it's very hard to find the riad by yourself so ask for someone to wait for you outside the medina and take you to riad Ghemza.