BagofDepravity

Yes. It's a habit he picked up before even ending up in the past.

He's thirty-three. Mentions it in the first chapter. And by fishing from Rosmerta, he's figured out that he's arrived during the summer before his fifth year, so right around the start of the fifth book.

The Blood Curse came from Harry Potter and the Cursed Child, which I'm going to be honest, I try to pretend doesn't exist. So no, she is not cursed here.

Just because of where they're going. They'll need a boat eventually to reach Hawaii, but going from New York to the California there's no body of water you could take that would get you as far as something like a direct train trip. Unless you went all the way around through the Panama Canal, but that takes way longer, like when Luke's cruise ship disappears for most of a year in cannon when he sails it to SF.

The supernatural beauty thing does a lot for people, and the French bit is a plus too. Technically, though, she won't be the first girl to feature in this one, or even the second or third...