Is there an idiom that can be used to describe the specialty of a situation/object?
For instance,
the <best part> of living alone is the privacy.
Is there an idiom which can be used for such a sentence?
I'm looking for a rather well-known phrase originating from literature, like how 'Achilles' heel' is used to describe a fatal flaw.
How about the well-known idiom silver lining?
M-W: a consoling or hopeful prospect
Cambridge: an advantage that comes from a difficult or unpleasant situation
The Free Dictionary: a consoling aspect of a difficult situation
Your example:
The silver lining of living alone is the privacy.