...Must Come to an End (2) - S6-E24
Revealing mistake: Immediately after Jen dies in the hospital room, Grams wakes up and notices something is wrong. She stands up and checks Jen's pulse, using Jen's left wrist. You can see a clear small marking/line of some kind on Jen's wrist, and Grams slides her fingers directly over this mark to check the pulse. Apparently the mark was a cue for Grams to know where exactly to place her fingers in the scene.
Answer: It's the same apartment Joey had in NYC. Comparing it to the beginning of the Finale; you can tell it's exactly the same location, furnishings, Plasma TV etc. Apparently Chris was only living with her at HER apartment, and now Pacey has taken his place at the end. I guess this implies Pacey successfully started his own restaurant business in NYC as he had dreamed, to be with Joey.