Bluebell Farm Cottages is on the edge of Belford village. Lindisfarne Cottage is one of four in a row. It's at the end of a no-through road, so it's quiet.
The cottage sleeps four. It's three bedrooms and one bathroom. It's a 3 Star rating, so it's comfortable and clean, not luxurious. Everything works. The garden is enclosed, which is handy if you have dogs. You can bring two pets. There's parking right outside.
Inside you've got a TV, Wi-Fi, and a washing machine. Bedding is included. There's a cot and a highchair if you need them.
Belford has what you need. There are a couple of pubs that do food, a shop, and bus stops. Bamburgh is about five miles away. The beach there is huge and the castle is hard to miss. Holy Island, or Lindisfarne, is a short drive away but you have to check the tide times for the causeway.
From here, the Northumberland coast is easy. You're about halfway between Alnwick and Berwick-upon-Tweed. Both are worth a visit. The beaches at Beadnell and Seahouses are a ten to fifteen minute drive.
For planning trips, these are useful: Northumberland Coast and National Trust North East.