Daaaaaaaaaaaaaaaaaaamn, Emilia Clarke is smokin'.
I find it quite interesting how their accents differ so much from their characters considering there isn't a lot of continuity for the accents in the show.
For example, Jon Stark has a north-midlands accent, slightly nasally (Blackburn?) whereas the actor is Scottish. However no one else from Winterfell uses that accent. Ned Stark had more of a Yorkshire accent, I think. Jon Snow waivers in and out of a slight Northumbrian accent.
The interesting one in the video above for me is Nicolaj Coster-Waldau. He pulls of a very good Middlesex accent in the show but reverts to his Dutch affected English when speaking normally. It fascinates me that he doesn't adopt it as his voice.
They do a good North/South divide but it isn't always coherent.