There's lots of space up front for even very tall people to get comfortable, but despite the Mustang Convertible's sizeable proportions, the two rear seats are decidedly cramped. Children and particularly short grown-ups will fit, but average-sized adults won't unless they don't mind sitting cross-legged. At least the long doors mean access is a little easier than it is in the BMW 2 Series Convertible. The Audi A5 Cabriolet is a more accommodating four-seater, though.
Still, it’s not all doom and gloom. The Mustang Convertible gets Isofix mounts in the rear, so two child seats will be secure there. Good luck defending it to your better half as a sensible family car, though.
Officially, the Mustang Convertible has a bigger boot than its immediate rivals. There’s 332 litres of space with the rear seats in place, and you can fold them down when you need to carry longer items. A set of golf clubs or a small buggy will fit, but a narrow opening and a high load lip make loading broader items quite tricky.