I'm picky when it comes to shows but this one was up to my standards. History and the atmosphere were authentic. The plot was intriguing, keeps you on the edge. The supernatural stuff was not extremely fantastic, they managed to keep it believable(so far). One thing I really liked is that all the characters are very likeable, it makes you wonder everyone's story, you don't get bored to see some of the characters.
Honestly I had a bit of prejudice before watching, but it surprised me. Overall, it's a very solid underrated show.