There's generous space for two adults in the front, with good head room and leg room, a decent glovebox, deep door pockets and a central cubby to stow your belongings.
As with most coupés, things get trickier if you want to use the rear seats. For starters, access isn't that easy behind the front seats and, once there, anyone over six feet tall is likely to complain about the shortage of knee, leg and head room on anything but the shortest journeys. Still, average-height adults will be fine (just) and, compared with rivals like the two-seat Porsche Cayman, having the option of rear seats is a plus.
The M240i’s boot capacity is respectable too. It’s relatively deep and will cope with a couple of chunky carry-on bags easily. It’s a good-sized boot for a small coupé, but its narrow opening means getting particularly wide bits of luggage inside could be a struggle.