Older man, young girlfriend's mom comes to visit and confuses man for caretaker?

[questions]

was it a woody allen film?

part of me thinks it's manhattan.

the guy lives in an open air two-story apartment with a winding staircase.

i believe the mother received a letter from the daughter with her whereabouts, and when she meets the man she doesn't know he's dating her daughter.

anyone know?

thanks!