Rhosydd Cottage is in Llandyfrydog, which is a small village in the middle of Anglesey. It's detached, so no neighbours on the other side of a wall. The garden is enclosed, which is good if you're bringing a dog or kids.
It sleeps six. Three bedrooms, one bathroom. It's got a 4 Star rating, which means it's comfortable and well equipped. There's a log burner for colder evenings, and a hot tub in the garden.
You're out in the country here. The nearest shop and pub is about two miles away in Llanerchymedd. For a bigger shop, you'd go to Menai Bridge.
The coast is about a ten minute drive. Red Wharf Bay is a good, sandy beach. For something more dramatic, the cliffs at South Stack are about half an hour. The RSPB reserve there is excellent for birdwatching.
Beaumaris is fifteen minutes or so. The castle is worth a visit. Plas Newydd house and gardens is about twenty minutes away. Snowdonia is easily doable for a day trip, maybe forty minutes to get into the national park.
Facilities: everything on the list is there and works. The WiFi is decent. Bedding and towels are included. Parking for two cars on the drive. You can bring one well-behaved dog.
Useful links for planning: National Trust Wales and Visit Anglesey.