We dined here on our last night in Marrakech.
The restaurant itself is nicely decorated and the staff were helpful and pretty attentive (I generally found service in Morocco to be lack lustre but Al Fassia was better than most).
The food was really excellent. We had pigeon pastilla for starters which were delicious - only complaint was that they were too big to be a starter but I don't think that can really classify as a complaint.
We both had chicken tagines for main course (mine with squash, my better half's with olives) - both excellent and very happy customers.
Would definitely recommend.