The Bittern is number 30A down by the quay in Blakeney. It's part of a terrace of cottages. You're right in the middle of things here, about a five minute walk from the water.
It's a 4 Star place, sleeps four. There are three bedrooms and two bathrooms, which is handy. One pet is allowed. The stairs are fairly typical for a cottage, so they're a bit steeper than in a modern house.
You've got a small patio area out the back. Inside, it's got everything you'd need: a washing machine, dishwasher, WiFi, and the TV. Bedding and towels are included. There's a cot and a highchair if you need them.
You're very close to the pub, about a minute's walk. The village shop is the same. For the beach, it's a short walk down to the shingle. The whole point of staying here is you can just wander down to watch the boats or go crabbing.
If you want to explore, Wells-next-the-Sea is about a 15 minute drive west. Holkham and Brancaster are a bit further along that coast. Heading east, Sheringham and Cromer are within half an hour. It's good walking country, especially along the coastal path.
Useful links if you're planning trips out: National Trust North Norfolk and Visit Norfolk.