My wife and I stayed here for four nights in March 2013. Really friendly staff, lovely roof terrace and good rooms. Bedrooms are a little basic but if you can live without TV they are pretty good - lots of nice features. We had a great shower in our room.
The breakfast is really good and it's nice that you can have it where ever you want in the Riad. There are lots of nice quiet spaces and, if the weather's good the roof terrace is a lovely place to sit.
The main sites of Marrakesh are really easy to get to (2 mins from the main square) - the area is safe and clean even if it feels a little spooky to start with you quickly get used to it.
We booked a tour to the foothills of the Atlas Mountains through the Riad - it's more money than you'll pay if you go into town to sort it yourself but the guide that Dar El Souk hooked us up with was really great and it was worth every penny to know we were in safe hands and not being dragged around lots of shops.
So, nice place to stay in a great location with lovely staff and friendly owners - very good all round and well worth considering if you're looking for a good base to go and explore Marrakesh from.