The 2010 Benz SLK has one of the most comfortable and luxurious cabins in its class. Most drivers will be pleasantly surrounded by ample leg- and headroom, though Cars.com notes that the "cabin is definitely cozy if you're around 6 feet tall," and that "even though [they] were able to get relatively comfortable, [they were] never able to put the seat exactly" where they wanted to.
The SLK's seats are proportioned generously, with sporty bolsters and plenty of lumbar support for advanced maneuvers. Kelley Blue Book reviewers love the "supportive bucket seats" on the Mercedes-Benz 2010 SLK-Class, while Edmunds mentions the "power heated sport seats."
Cargo space suffers when the retractable hardtop is lowered, though. Edmunds says "the folded top naturally eats up trunk space" and leaves just "6.5 cubic feet" for luggage and carry-ons. While the "retractable hardtop still eats up trunk space," Kelley Blue Book asserts "the design responsibly leaves some usable room for storing small luggage and valuables."
This SLK is far better finished inside than the previous car, and various trim options give it even more of a custom look. Kelley Blue Book observes "the perfectly aligned side bodylines appear as though carved from a single block of steel," while Edmunds says that the interior "materials are generally beyond reproach," with "soft, high-quality plastics" throughout. Cars.com reviewers find "a little bit of wind noise can penetrate the cabin on the highway with the top up," but Popular Mechanics reports "top-up motoring is appropriately insulated thanks to the folding hardtop."