That ... was the co-worker because she obviously has serious mental issues pinning after this mega-douche-dipshit... I mean the MC. And yes, that is the exact same room because that ... guy ... couldn't get over the woman who tried to murder him so he moves into her old apartment to be as close to her as possible while trying to re-live the only time in his life he ever felt ANYTHING. SO it was a match made in heaven ... he can be a total douche and she gets to be a sponge for verbal (and maybe even physical) abuse. True luv bruv ... LOL.@Nakewameke
Wait so is he getting blow from his coworker or some random thot that he seduced on the subway at the end? Because he's in 402 so I assume he's started sexing people the same way, going by the dialogue and the way it ends on the doorplate.