If a high school theater ensemble made a Riviera rehash of "Downton Abbey", with a reverential scent of Jane Austen on everything, this is probably very close to what the finished product would look like.
It's not completely bad, but everything feels slightly campy and counterfeit all the time. The "bad guys" are almost all cartoonishly shady, bordering on old-school mustache-twirling villains - even the women, constantly displeased and scheming.
And the many anachronisms surely don't help either. Back in the 1920's, Italians didn't speak English: it was not taught in school, it was not heard on the radio and was not read anywhere. So it's utterly lazy writing to have them magically understand the show's English characters. Even worse, this was when religion and fascism ruled unopposed: the show's young black woman wouldn't have been allowed to sashay around like she owned Portofino. In reality, she would've been arrested, or even publicly beaten by Mussolini's Black Shirts. Simply put, several of the characters don't make much sense.