Flew there earlier in the year (from UK). One to watch is that to buy fuel with cash at Marrakech they want you to provide evidence from the bank - signed and stamped receipt proving it was purchased in Morocco. Till receipts are NOT acceptable, nor are normal Credit Card etc! We argued for an hour (even with receipts but not stamped!). On the other hand Tangiers were more than helpful!
English is generally usable - but I would try and brush up on your French before you go, ATC etc. is fine but many airfield staff use French. They dont seem to do "open" VFR , everything is flight plans to recognised routes and you are expected to follow them (ish).
Charts seem hard to get hold off you seem to have to go into Casablanca. We used an American chart (borrowed) and marked the new reporting points when we landed in Tangiers. The guys in the office will help you file your plan and help with name pronunciation!
Here is their official site for the AIP
link
I did not see many local aircraft so not sure how easy it is to hire - good luck!