We stayed for 1 night, after happening upon this place while looking for a different riad. The Riad El Wiam is absolutely beautiful! Our room was large and comfortable with the most amazing marble (?) bathtub that I've ever seen. The staff pays tremendous attention to all details, and after a hectic and overwhelming day in the medina, we loved coming back to our quiet, peaceful room.
On the day we were there, the outside temperature was well over 100 degrees, but the riad was a relatively cool, comfortable temperature.
We did have trouble finding our way back to the riad after going out. I remembered reading a review for another riad on the same street that said to look for the 2 blue pots, and once we knew to do this, we were always able to find the right street.