Despite its low height and small cabin, the Corvette is a surprisingly comfortable car--once you're in. The low height and the somewhat tight door opening on hardtop models can make entry and exit a bit tough for some.
The seats are very comfortable, well-padded and bolstered, neither too soft nor too firm. The position puts occupants' legs out front, rather than folded below, but it's actually well-suited to long trips.
There's more cargo area than you might expect as well, with the rear glass (on coupe models) lifting to reveal a wide, flat load deck, though height is limited. In convertibles, there are cubbies behind the seats to add to the trunk's capacity.
Noise levels are not luxury-sedan low, but are well within acceptable limits, especially considering the performance nature of the Corvette. The only sound that's likely to intrude on the cabin with any force is that of the engine, and it's at least part of the reason anyone buys a Corvette in the first place.
Overall build quality is good, though fit and finish sometimes come up short of what you might expect given the Corvette's price--until you remember that the money went into the car's performance more than its semi-luxury accommodations.