Beach Croft is in Pembroke Dock. It's detached, right on the water. The main thing is the view. Every room looks out over the Haven Waterway. It's a proper working waterway so you get ferries going to Ireland and all sorts of boats coming and going.
It sleeps four. Two bedrooms, one bathroom downstairs. It's an upside-down house so the living area is upstairs to make the most of the view. The stairs are open plan, just so you know.
There's a pub and a restaurant about a quarter of a mile away. Pembroke Dock itself is half a mile for shops and things. The nearest beach is about six miles, so you'd drive.
It's a 4 Star place. It's clean and comfortable. The decor is all nautical themed. Facilities wise, you've got a woodburning stove, dishwasher, washing machine, WiFi, and parking. Bedding and towels are included. One well-behaved dog is allowed.
If you like birdwatching, you can just sit at the window. The estuary is a big site for it. For days out, the whole Pembrokeshire coast is there. Useful links for planning: Pembrokeshire Coast National Park and the National Trust in Wales.