The cottage is called Blue. It's one of three on a bit of National Trust land just outside Trefor. The road stops here, so it's quiet. The view is straight out to sea, no buildings in the way.
It sleeps four in two bedrooms. There's one bathroom. It's a 3 Star place, so it's clean and has what you need but it's not posh. You can bring one dog.
The stairs inside are steep and a bit narrow. They're original cottage stairs. Just take care.
You're right on the coastal path. A few hundred yards down, there are steps that take you directly onto the pebble beach. There's a small village shop in Trefor, but for a big supermarket you'll need to drive to Caernarfon.
Caernarfon is about a 20 minute drive. The castle is there, it's a UNESCO World Heritage site. It's worth a visit. The other way, you can be in Snowdonia National Park in under half an hour for walking.
You've got parking right by the cottage. There's a woodburning stove for cooler evenings. All bedding and towels are included. There's no wifi, but you might get a mobile signal.
If you're looking for information on the area, Visit Wales North and the National Trust Llyn Peninsula pages are useful.