Front passengers ride in comfort in the 2010 C-Class-and rear passengers are fine, so long as they're small.
Front-seat passengers in the Benz C-Class have plenty of room and wide, flat-bottomed seats at their disposal. The driving position is quite good, between the telescoping steering wheel, the power driver seat, and the car's tall, glassy cabin. ConsumerGuide deems the seats "supportive and comfortable" and says "even taller folks should find adequate headroom and legroom." Cars.com agrees; "it's easy to find a comfortable driving position," they report, thanks to a front cabin that "doesn't have the cramped feel of the 3 Series sedan."
The rear seats still are a significant drawback for full-sized adults, though. Average frames will have enough headroom to be comfortable; taller adults will lean over to fit in, and all rear passengers will find legroom at a premium, even when the front passengers inch forward. Edmunds feels that although the interior is larger, it is simply "not very spacious" in back. Cars.com adds that the "three-place rear seat is on the smallish side, with limited legroom and headroom."
The trunk is a little small for its class at 12.4 cubic feet, but interior storage has been bumped up to first class, with a big console, cup holders, door pockets, and a sizable glove box. Storage space, especially in the trunk, is adequate. Edmunds observes the trunk "can be expanded with the optional split-folding rear seats." ConsumerGuide feels that "the trunk is narrow," but the overall "area is quite deep and nicely trimmed." ConsumerGuide asserts "interior storage is adequate at best with a somewhat skimpy center console, two open console cupholders, and a decent-sized glovebox."
Aside from some middling trim in the base car, the C-Class's fit and finish benefit from fewer pieces, fewer cutlines, and simpler styling. ConsumerGuide raves about the "nicely padded surfaces and upscale trim," and Kelley Blue Book mentions the "tasteful wood inlays" that "surround the cabin." Edmunds judges the interior to be "beautifully crafted" and reports "excellent build quality."
Both the Sport and the Luxury C-Class models have quiet cabins with good isolation from the road, although you hear the engine when accelerating. ConsumerGuide praises the "level of serene isolation" that "few in the class can provide." Edmunds also gives a nod to the "more serene driving environment" and points out the Luxury model has a "quieter exhaust system" than the Sport.