We earn a commission for products purchased through some links in this article. 1 Seahouses, Northumberland It's hard to beat the Northumberland coastline for unspoilt sandy beaches, and this stunning and spacious Airbnb apartment offers floor-to-ceiling views of the harbour and crystal-clear seas from almost every room. The sleek, quiet-luxury styling and sociable open-plan layout make this the perfect spot for groups of friends or couples wanting a sophisticated seaside getaway.