Many electric cars and smaller hatchbacks are saddled with short, flat seats, but the B-Class includes full-size, well-shaped seats that felt, refreshingly, like we could have spent several hours non-stop in them with absolutely no complaints (a boon for those who must commute in near gridlock).
As for the area behind the front seats, it's excellent for passenger comfort although somewhat compromised for versatility and cargo. Since the floor edges upward under the front seats, the back seats are low-set on the floor, leaving taller adults (like this one) to fit just fine but feel that they're in a knees-up position. Also, the seatbacks flip forward, but you'll need to manually click the headrests to their lower position (or remove them) in order to fit, and once you get the seat folded, the cargo floor isn't flat—there's a step up.
However the load height is very low; the hatch lifts up easily and, while it doesn’t have a power release it's easy to reach for those who aren’t tall or lanky.
Ride quality isn’t perfect (with the B-Class’ short wheelbase, it can feel a little busy on some choppy surfaces), but it’s composed the vast majority of the time and soaks up all the major bumps. And this really is a quiet interior—the quietest of any of the small all-electric models we've driven so far.