This is wrong and a bit ignorant. Not all "third world countries" are alike.
Most countries have an "oven" of some form in their traditional kitchens: it's just not a branded appliance with an electric element, temperature setting, timer, or glass door.
If you're staying in guest accommodations, you won't have anything to cook with - exactly what you'd also expect in the West. I would recommend regardless that you take up some kind of cooking class to learn how to make the traditional food with the traditional ingredients in the traditional kitchen.
If you get an oven, you'll probably be dealing with a clay oven fueled by charcoal or wood. This is arguably the superior way to cook because the temperatures are far greater, the natural humidity, circulating air, and the excellent heat distribution and retention due to their shape. Alternately, should you be so lucky to try tagine cooking, you might discovery the sublime flavor of braising fish and vegetables in their own juices.