I picked up a bright yellow Jetta here today. The car was in good condition in and out. There was some dog hair and big long nasty red head hair on the passenger seat which kind of grossed me out but that sort of comes with the territory. The car had a pungent odor to it when I first got in but that may attributed to the parkade it was parked in (the stairwell did smell like a heavily used urinal).
Locating the car was a little funny, but Zipcar's directions were very helpful. Basically you walk down Church and go down the alley beside Zelda's and the door is well marked on your left.