Fill/fit the bill
Definition 1 of 1
Pro Tip 1/3Idiomatic Usage
Mainly used in idiomatic contexts, so it can seem out of place in very formal writing. 
While writing a formal report, 'meet the requirements' is preferred over 'fills the bill'.
Pro Tip 2/3Personal Suitability
Often used when a choice is well-suited to one's personal needs or tastes. 
For a foodie like me, a kitchen with modern appliances really fills the bill.
Pro Tip 3/3Cultural Expression
In American English, it's more common to say 'fit the bill' than 'fill the bill'. 
I need a budget-friendly hotel, and this one fits the bill.