The best Airbnbs in Cornwall include an eclectic lodge set in the grounds of an ancient castle, a boathouse that’s found hovering over a lake, a smart apartment in the centre of one of the county’s buzzy towns and a farmhouse big enough for the whole crew. Some are right on the coast while others are in the Cornish countryside – but they all have clever interiors and wonderful surroundings in common. Take over one of these homestays for a salty seaside adventure of your own.