The video sees the actor speaking from the Wales Millennium Centre in Cardiff Bay (seen most recently in The Girl Who Waited), enthusing about his 'second' home of Cardiff, its people, social activities and their passion for sport (such as the rugby at weekends!).
As well as Cardiff itself, the actor also reflects upon being the Doctor, and the varied locations in the surrounding area that have featured in the show:
One of the virtues and benefits of filming Doctor Who in Wales is that it affords such a variety of locations - each one of those locations has such scale and it's very accessible. We shoot in a lot of quarries, a lot of forests, a lot of castles - Caerphilly Castle, Cardiff Castle - and then if you get out into the countryside there's some really wonderful beaches, and the landscapes of those beaches feel very panoramic, particularly filmically.
Doctor Who's Guide to Cardiff, VisitBritain, via BrightCove
The video is one of a number that have been recorded to promote the United Kingdom, with others featuring notable names like actor Luke Evans talking about Wales, actress/director Asha Gill on music, and Dame Judi Dench on Hever Castle, the childhood home of Anne Boleyn.