This story is really charming. Love how it deals with both entirely practical realities of the human world and the strange lives of the fey without either of those feeling out of place.
I like the romance side of things more than I expected to. Edgar is the dangerous seductive type and the story handles it wonderfully. It's not that his moves don't work on Lydia; they do, she's just seen him do it so many times to so many people she doesn't see any genuine interest behind his words, and on his side, he's too wounded from his past life to be able to speak his feelings openly and honestly, without hiding behind the polished veneer of his trained persona. It's easy to feel for Edgar while finding Lydia's reactions completely reasonable. It is my hope that the romance will be resolved when he realizes it's not games and seduction but honestly opening his heart that is the way Lydia accepting him.
Also a cool revelation of this volume, that while Edgar is a scoundrel and impostor, he takes his duty to the people of the earldom very seriously, which I'd say does a lot to rehabilitate him as a male lead. After all that's not something even real nobles always manage. (But being the scoundrel he is, he still manages to do a lot to, uh, unrehabilitate himself again.)
Love how alien the fairies often are. "He isn't the same man your queen met, he just inherited the title." "They cannot be too different, given they share the same name." Perfectly reasonable fey logic, right there. (-:
I'm also fond of the way certain people can almost see the faeries but not quite, like the way Edgar & Co sometimes assure themselves that of course Nico doesn't talk to them, he's a cat - althought they are also aware that he often asks to be served tea...