Heron Apartment is in Berwick upon Tweed. It's on the ground floor of a building in the old part of town, but not right in the very centre, so it's quiet. You can walk to the main streets in a minute.
It sleeps four. Two bedrooms and one bathroom. One bedroom has a king size bed, the other a double. It's got a 4 Star rating. It's modern and everything works.
The flat has a washing machine and a dishwasher. The wifi is good. Bedding and towels are included. There's parking on site.
Because it's all on the ground floor and the entrance is level, it can work for someone with limited mobility. Check with me about specific needs.
Berwick is a proper old border town, full of history. The town walls are right there for a walk. The coast is on your doorstep. In half an hour you can drive up into Northumberland for the big beaches like Bamburgh, or go west into the Scottish Borders hills.
Useful links for planning: National Trust North East and Northumberland National Park.