The same goes when she meets other leaders; they seek her out, she's engaging. Even the stodgy royal family seemed impressed.
Back home she's had her trials this year, but for her that's political reality. She'd be ill-advised to ever again use the phrase "read between the lines". It was an invitation that came back to bite her and damage the Government for the silly Karel Sroubek immigration decision.
Like John Key, Ardern likes to be liked - and, like him, that's not hard to do.
The same can also be said of Simon Bridges, who has a warm and friendly manner.
He's an engaging, self-deprecating character, often joking about his unusual, round-vowel way of speaking. When he reflects on the past year, he should think about the phrase "I have done absolutely nothing wrong". Clearly he'd done a lot wrong in pressing ahead, against all advice, with an inquiry into a piffling leak over his travel expenses, not long before they were officially released.
He could never have envisaged the wrath of Jami-Lee Ross, or maybe he should have. His handling of it has undoubtedly damaged his leadership. Only next year will tell whether it's irreparable.
Meanwhile, Bridges is stoic, telling me in a Christmas card that he tries not to take my rather consistent editorial line too personally.
There's nothing personal about being a theatre critic, for that's what this business is at times: pure theatre.