Hi,
We went to Marrakech in March 09. We had a wonderful time but it is positively biblical! We just wandered around the souks, had a drink on the big square and read books on the Riad roof terrace! It was lovely. Our Riad was fabulous - El Mansour - if you want to have a look on Trip Advisor. Everyone is very friendly but beware anyone who offers help, directions etc as they all want money. After you get over the fact that everyone wants something from you - it is easier.
Do not stop to look at a map or they will pounce!