Paul Elliott’s review published on Letterboxd:
Peppered with humorous punchlines and emotional pinches arranged for their utmost effectiveness, The Apartment is a fabulous showcase for producer and director Billy Wilder and screenwriter I. A. L. Diamond. Shirley MacLaine is consistently delightful in illustrating her enthusiasm in her duties as a lift attendant or when she's making an effort to be cautious regarding her regretful philandering.
Additionally, Jack Lemmon is customarily outstanding and depicts his role with all the desirable characteristics that project just the right amount of passivity without crumbling into luxurious redundancy. It attains an emotional warmth and displays an appreciation for people that successfully converges in it being an excellent example of character development and story structure, and was the last purely black and white movie to achieve the Best Picture Oscar until The Artist in 2011.