We tend to think that stories which have the premise of "What if fairy tales are real! And in the real world!" as a sort of exclusively modern concept. But here is a book from 1900 that works on the same idea--except their "real world" is lightly historical to us.
That said, it's not a super wonderfully great book. The ...narrator has a tendency to insult/compliment the readers in slightly alarming ways, and the focus is on how wonderfully perfect the two young people are, rather than on world-building or plot or really anything else at all. Plus there's a whole chapter that the author/narrator strongly suggests you skip, which makes me wonder why I'm reading the other chapters in the first place.
But it's decent, and I enjoyed reading it, and sometimes I liked the way the fairy tales were interwoven, both in how the characters told them, and in how the characters lived them. The fairy tales that the characters tell are traditional ones, too, and not lightly altered like most are in modern books, so that was neat, too.