Pebble Beach Cottage is in West Lulworth. It's thatched, end-of-terrace. Sleeps eight. Four bedrooms, each with its own bathroom, which is handy with a group.
It's got a 5 Star rating. That means it's well looked after and everything works. It's not overly fancy, it's just a nice, solid cottage.
You're right in the village. The shop and a couple of pubs are a two-minute walk. One of them, The Castle Inn, is very old and thatched. They do good food.
From the cottage, you walk about ten minutes down the hill to Lulworth Cove. It's a sheltered bay, good for a swim or a paddle. The coastal path from there to Durdle Door is stunning. It's less than a mile, but it's up and down. The arch itself is the one you see in pictures.
For a bigger beach day, the main beach at Lulworth is shingle. If you want sand, Weymouth is about twenty minutes by car.
The facilities are all there: dishwasher, washing machine, WiFi. The garden is enclosed. Parking for two cars on the drive. You can bring up to two dogs.
Useful links if you're planning your trip: Lulworth Estate for cove information, and the Jurassic Coast Trust for the wider area.