I'm definitely really enjoying it so far.

(Though still, poor Rose)

Are you sure you won't write more through Cassanova's POV? Personal preference aside (which basically is a preference for enigmatic!Rose/"outside, looking in" POVs, or even just people getting thrust into worlds beyond their imagination), your Cassanova has this... sad air about him.

He'd never stop. He was beginning to believe he could wander the entire world and never find a place that hadn't heard his name

Like here. You just made everyone go awww...