It's called Ein Lle. It's a ground-floor apartment in Tenby, about a hundred yards back from South Beach. You can see the sea from the front room.
It sleeps four. Two bedrooms, one bathroom. It's a 4 Star place, so it's well done. The kitchen is a galley style with a breakfast bar. There's a small private courtyard out the back.
You're right in the town. The beach, a pub, and a restaurant are all about a minute's walk. The shop is two minutes. It's busy in season, but you don't need the car for anything once you're here.
The Pembrokeshire Coast Path is on your doorstep. You can walk to Saundersfoot along it if you want a proper stretch. For castles, Manorbier, Carew, and Pembroke are all within a half hour drive. If you've got kids to entertain, Oakwood Theme Park, Folly Farm, and Heatherton are also about twenty minutes away by car.
Facilities: it's got a washing machine, dishwasher, WiFi, and TV. Bedding and towels are included. There's a cot and a highchair if you need them. No pets, I'm afraid.
Useful links for planning: Pembrokeshire Coast National Park and National Trust Pembrokeshire.