If you’re tall and a hot hatch fan, you’ll fit in the front of i30N without any issue, thanks to plenty of head and leg room.
All models come with five doors, so getting in and out of the back is made easier, but there’s not a vast amount of space inside. Head room isn’t the problem; it’s the leg room. It’s much tighter than the back seats of a Type R or Golf GTI, although still better than the Focus.
The boot isn’t as big as the Honda’s or the Golf’s, either. That said, there’s enough space for a couple of large suitcases without resorting to dropping the standard 60/40 split-folding rear seats. Be aware that when you do, the Performance model comes with a rear suspension strut brace running across the floor, which you'd have to remove if you want to make use of the flat extended load area.