It's amazing what turns up in a seasrch long after the show has ended. An extended version of the Da Vinci's Demons season 3 set interviews with Tom and Laura Haddock has been shared on this site. About 4 or 5 minutes of the interview was shared (in small parts) on various FOX channels as season 3 was broadcast, but nowhere uploaded the entire 8 minute interview.
The extra few minutes explore Tom and Laura's favourite scenes to film in season 3. All three Da Vinci's Demons seasons are available on DVD, Blu-ray and can be viewed on Amazon, iTunes and some other reputable online streaming sites.