There’s a coastguard ‘ s cottage with lovely views over the sea at Burnmouth, just above Berwick. A bit further up the coast there’s a cottage on a beach with a little secluded fishermen’s harbour, access through a sandstone tunnel, at the bottom of a cliff, no vehicle access, at a place called Cove, near Dunbar. I know it’s in Scotland not Northumberland, but it’s a gorgeous location, wild and romantic