It takes considerable chutzpah to claim you're making an adaptation of The Decameron and then completely ignore the original work except for the premise of the framing story and write an original series using that purely as a jumping-off point. But that's what Kathleen Jordan has done.
The central theme is the relationship between masters and servants, but there is a lot of other material in here too.
The series looks ravishing, is very funny in a gallows-humour way, sad and not entirely irrelevant to today's world. If you want a TV version of Boccaccio's "Decameron" you'll be sorely disappointed (try Pasolini's film for a sample of what that would have been like), otherwise, enjoy.