Had a great time reading this. Love the Victorian set-up and the steampunk-ish feel. Interesting characters, I'm especially fond of Charlotte and Henry, but I also like the main trio. The story is entertaining, no big surprises but, as with The Mortal Instruments, I really like the way things unfold, as well as the universe in general. Meeting characters from the first trilogy was a great bonus. 
 Am definitely looking forward to starting Clockwork Prince (even though I can feel a love triangle coming. I really, really don't like love triangles, but it seems they're mandatory in Young Adult literature). First though, City of Fallen Angels! As soon as I find it.