The roads there are pretty narrow, plus traffic moves on the left side. A huge vehicle will just get stuck in the villages, so a tiny hatchback makes the drive a lot easier. You can find options to rent a car in Malta here: https://getrentacar.com/en-US/malta . This marketplace connects you directly with local owners who post their vehicles. You get to check out the exact specs and photos before choosing a ride. Having a compact vehicle makes finding a spot near those old stone walls way easier.