Swyn Y Don is in Llandanwg. It's a detached cottage, so no one attached to either side. You've got your own garden and a hot tub out there.
It sleeps six. Three bedrooms, one bathroom. It's a 5 Star place, which means it's been done up to a high standard. Everything's in good order.
The stairs inside are okay, but they are typical cottage stairs. So watch your head a bit on the landing.
You can walk to Llandanwg beach from here. Five, maybe ten minutes. It's a good beach, sandy and the water's shallow. The coastal path runs right past it if you want a longer walk.
Harlech is very close. The castle is there, it's a Cadw site. The Royal St. David's golf course is there too. Barmouth is a short drive along the coast for shops and cafes. The Snowdonia National Park starts not far from here, so you're well placed for mountains like Cader Idris.
For facilities: there's a wood burner, dishwasher, washing machine, WiFi, TV. Bedding and towels are included. There's parking for two cars on the drive. You can bring up to two dogs.
Useful links: Cadw for the castles, and Visit Wales for general trip ideas.