Generally tandems are "Marmite".
We love ours, but I also know couples who've tried it once and sworn never to do it again. Needs a lot of trust in the pilot and great communication for the stoker.
I'm not sure what sort of cycling you're planning in Marrakech, but having been there once myself last year a few observations:
- tandems are hard work in traffic. Not manoeverable, slow to start, need to anticipate rather than react to what's around you. From my experience of Marrakech traffic, I definitely would not recommend one as a means purely of getting around in the city.
- tandems are great on the flat, the plain around Marrakech would be perfect from a terrain perspective.
- up hills, tandems are slower than normal bikes and it's very difficult to get out of the saddle. Plan to go slower than on a solo when riding and also more breaks from a comfort perspective.
- down hills, a tandem is very fast, and brakes overheating is an issue on long or steep descents. If you're planning to go up in the Atlas, a drag brake is absolutely essential IMV.
Best of luck!