The Granville Apartment is in Broadstairs. It's a basement flat, so it's below ground level at the front. You get a good bit of natural light in the main room though.
It sleeps four. There's one bedroom with a king size bed, plus a sofa bed in the living space for another two. It's a 4 Star place, so it's comfortable and well kitted out, not just basic. The bedroom has its own shower room. There's also a separate wet room with a shower off the hall.
Viking Bay beach is very close, about a hundred yards. You can be on the sand in a few minutes. The town centre is right there too, with shops and places to eat.
The flat has a small enclosed patio area out the back with a barbecue. It's private.
Dover Castle is about twenty minutes' drive if you fancy a trip out. Canterbury is about half an hour away. You can walk along the coast path from Broadstairs in either direction.
Things you get: WiFi, a TV, a washing machine, dishwasher, all bedding and towels. One well-behaved dog is welcome.
For more ideas, the Visit Kent site is useful, and the National Trust has places like South Foreland Lighthouse nearby.