Anywhere north of Amble and south of Berwick is nice – newton by the sea, beadnell, bamburgh, Alnmouth, Boulmer village(Quiet).
Seahouses is a bit chip shop and rock so maybe avoid that but it is still ok.
I was there last week and spotted a holiday company called grace darling holidays on the high street who had really nice cottages on the books.
http://www.gracedarlingholidays.com/
also
http://www.northumbria-cottages.co.uk/
However – i have no affiliation with any of these companies what so ever.
Come up here spend your money in our pubs and shops. This area relies on tourism nowadays, I’ve lived here all my life and dont mind tourists invading – my family have a business that needs tourists as the main residents dont support us and do their shopping in the ususal Tesco/Asda.