I can just recommend Riad Ghemza to anyone looking for a genuine Marrakesh experience. I was in another riad before, but Riad Ghemza was even better.
Although we got lost on our first day in the souks (which was due to my knowledge of the French language, which has decreased because I don't use it a lot - *SHAME*), we never got lost again afterwards. Just have a good look at the map you get when you arrive (my fiancé didn't).
The personnel is very friendly, have very good tips if you ask for other activities (especially the cooking course at Le Faim d'Épices - a must-have for all cooking-addicts - which we booked before we arrived there but is recommended at the riad as well!).
So thank you very much to everybody at the Riad Ghemza for a wonderful stay, we will be back again (probably during our honeymoon as my fiancé proposed to me on the wonderfully romantic terrace of Terrasse de la Medersa during our stay)!