I find it interesting that, while the overall rating for this series is near 7, almost everyone who bothered to review it didn't like it.
I, on the other hand, enjoyed the series. The sets are nice, the characters are appealing, and it's all briskly paced.
Certainly, I could pick at things. The plotting is at times not quite logical and at others unrealistically tidy. The band music is not especially true to the period; they sound more like a neo-Swing band from the '90s. Characters are likable enough, but there wasn't anyone I liked to the level of almost any character from Downton Abbey.
But I (and my girlfriend) enjoyed it all the same.