"a perfect addition" is correct and usable in written English.
You can use it when you want to describe something that completes an existing thing in a positive way. For example, "The new sofa was a perfect addition to the family room."
The 70's pop powerhouse Todd Rundgren is a perfect addition to the bill.
Sounds like a perfect addition to the surreal world of Welcome to Night Vale.
Lyrically, its anti-establishment lyrics and chorus of "I'll never conform" would be a perfect addition to the soundtracks of any John Hughes films from that period.
Given how Branca became the poster child for the hapless Dodgers, this discovery made him a perfect addition to the short, brutish list of Jewish ballplayers.
DeGroote believes Penguin would make a perfect addition to the publishing company that Rupert Murdoch intends to set up to house assets including the Wall Street Journal, the Sun and the Times papers, and his book publisher HarperCollins.
The Met "doesn't consider other museums competition," Harold Holzer, the museum's vice president for communications, said, "and we think the Rose Center is a perfect addition to the neighborhood".
Flowers at Easter time are an absolutely perfect addition to the table setting.
Whether it's the overly generous swath of inventive original trick weapons, the three new yet eerily familiar environments, the advancement of the game's already cryptic lore or the brutally hard selection of new boss fights, The Old Hunters is a nigh-on perfect addition to a modern classic.
Red lipstick adds drama and makes a statement, which makes it the perfect addition to an eye-catching New Year's Eve outfit.
A good mom quote might be the perfect addition to a card or provide inspiration for gift-giving.
Whether you're a founder on a fundraising mission or an investor searching for the perfect addition to your portfolio, you want to make the most of your limited time at Disrupt Berlin.
