For its price range, the interior is nice but not special, the seats comfortable and supportive but not sporty, and the cargo room is better than you'd expect with the almost coupe-like profile, especially once you lay down the 60/40 split folding seats.
The fit, finish, and feel of the Mazda2 really is one of inexpensiveness, not cheapness. There's no outright lack of quality, but rather a cost-conscious lack of polish and panache. And that fits right in with the Mazda2's role as a cost-conscious city car, fuel-conscious commuter, third/fourth car for the luxury/sports car owner, and entry-level sporty hatch for the first-time buyer or college student. The plastics used aren't particularly pretty, but they feel durable; they aren't particularly nice to the touch, but they enclose the cabin quietly and without squeaks or rattles; the fabrics aren't premium, but they have texture that makes them feel and look like more than simple cloth.