From the movie Fantastic Beasts: The Crimes of Grindelwald (2018)

Whose address does Dumbledore give to Newt in Crimes of Grindelwald, in case he needed a safe house in Paris?

Nicolas Flannel. Dumbledore’s long time friend Nicolas Flannel has let him use his house as a safehouse for any potential allies. Dumbledore then gives a card with the address to Newt. Newt comes to the safehouse with Jacob, Tina and Yusuf, when they’re tracking down Credence.