We arrived at this riad on Christmas day and was greeted by 2 of the guys who run the place, they were great- helped us with our bags, free wifi, maps of the area, etc.
The room we stayed in wasn't very big, but big enough for all our stuff (we had surfboards too). Our ensuite bathroom was a reasonable size but we had a damp smell lingering there, I think the sewage system in the medina isn't great and so hence the bad smell, but we bought some incense sticks from one of the many shops which covered the smell.

We had the best night's sleep here throughout our entire holiday; the staff are very thoughtful and turned off any music after 8/9pm, and even at breakfast (served in the centre courtyard) they were very quiet and whispered for those still asleep.
Breakfast is plentiful (lots of bread, croissants, etc) served with butter and jam, with a choice to drinks. The terrace up top is a great place to chill out, read, etc. You can even hang any hand washing up here.

The guys here were so helpful, we had a problem with our rental car and the manager took us to get the wheel and tyre fixed at a very reasonable price from a local garage (a lot less than Hertz would've charged us for the damage!) he was able to converse with them in arabic and explain our problem, saving us a lot of time and money.

The riad is perfectly located in the medina and easy to find, you can walk to the port and beach within 5 minutes, and there's plenty of restaurants nearby for all tastes.
We only booked into the riad for 2 nights, we extended it for another couple of nights as it was such a nice place. We even recommended it to a family we met in Taghazout, they left the same day and headed straight to Essaouira for this riad.
We did stay in another riad which was voted best in the Lonely Planet book, but we both agreed that this one was much better, more cosy, more homely, much quieter and the best night's sleep you'll ever get.