More a fortified manor house than a true castle, this is Astley Castle in Warwickshire.
With a curious modern building (house) built within? Brilliant!
Yes, in the 70’s it was a hotel but following a fire in 78 it lay derelict for some years then in 2012 the owners along with English heritage and the landmark trust renovated it and turned it into a holiday let.
Sleeps 8, four days cost from £1098!