Rachel absolutely hates living in Joey and Chandler's apartment after losing the game and bet to them.
REFRESHER The bet was if Monica and Rachel lost the game, then Chandler and Joey move into Monica and Rachel's apartment.
She says she hates the color, hates how it smells like birds, and how its a "guys apartment".
HOWEVER... When she later moves in with Joey due to Monica and Chandler getting together, the apartment is in even worse condition than it was when she was previously living there with the well known neat freak Monica.
It just didn't make too much sense to me, and I know that this is just a nitpick, and it could just be an oversight of the writers and crew, due to how many episodes were made.