Season 4 was better than 3 IMO. I really enjoyed it whereas S3 I struggled to sit through. It carried the story forward and pretty much finished the show. I felt closure after watching S4 and satisfied with the ending (if you ignore the last 2 minutes where they try to set up an unneeded 5th season.)

For torrents, search “Italian” on 1337x.to and there are regular uploads of dubbed shows or original Italian ones. That’s the best source I’ve found trying to get Italian content.