We stayed for three nights at Riad Maranna during our holiday with Real Morocco Tours.
Like most riads, it is located in the heart of the medina - and this one in Marrakech is no exception. Firstly, the staff are so very friendly and accommodating. Secondly, the meals (breakfast) were great.
The riad is tucked away down a couple of lane ways, so while it is probably a 2 or 3 minute walk through the labyrinth that is Marrakech in order to reach the amazing Jemaa el-Fna (the main plaza). Its not a bad walk - you walk past some interesting stalls, but the winding streets ensure that the stay at the road is so quiet and peaceful.
The rooms are very clean and well kept (the beds were very comfortbale), and the complimentary wifi was very useful!
Definitely a great place to stay if you want to an authentic experience in Marrakech.