From the 9Honey interview posted by polyesco:
Upon the mention of Tasmania, I ask why and he says, "Because I have family there, or relatives, it would be nice to come and visit".
The relatives he refers to are Crown Princess Mary's family.
"I haven't planned anything yet but I definitely hope to visit them, definitely," Count Nikolai says.
[...]
"I wouldn't say she influenced me, but once I told her she was very happy for me, definitely. Gave me all the good recommendations, introduced me to her friends, family here," he says.
"She wrote me a short itinerary of what to do and what to see, Palm Beach she recommended."
Crown Princess Mary also gave Nikolai a "survival manual with all the wildlife" and advised him to "tap [his] boots before wearing them, wear sunscreen everywhere".
Interesting that relationships between Frederik's and Joachim's families are so tight-knit that Crown Princess Mary devoted so much time and effort to personally assisting Count Nikolai with his travel plans, and he is now on visiting terms with her family.
It makes sense that the count selected Australia after hearing from his father and partner about their fulfilling experiences there.
I enquire about the state of relationship with his grandmother now.
"We have a nice relationship, yeah, she wished me happy birthday, we have a fine relationship," he says.
"We saw her for her birthday as well, that was really nice to get together."
[...]
Of the [back surgery] procedure, Nikolai says: "You can see she is standing up tall, you can definitely see it on her physically but also sense it emotionally on her, yeah.
I'm glad the Queen reached out for his birthday and that Count Nikolai is willing to speak to his grandmother again. It is nice that he can sympathize with the emotional challenges of her back surgery.