I think the interior sets for NX-01 are amongst the best ever built for any of the Trek series. They actually look like they might be functional areas of a starship to my mind. (At least in the context of Star Trek. I imagine the real thing might end up looking entirely different.)
Kind of cramped and awkward in places, but still looking like someplace you might end up working in. Unlike some of the other ships from other series that look more like they were built to be camera friendly first, and starship-like second. While i'm sure those same considerations were at play when they built the NX-01 sets, it doesn't look that way. Points for that.