A foldable Japanese shikibuton for a small home in Guernsey: measure the sleeping and storage spaces and plan somewhere dry to air it. Before choosing it for space saving, check where the bedding will air and where it will be stored. Those are two different jobs, even in a small room.
Can the cupboard be the drying space?
A closed cupboard is for dry bedding. After sleep, let air reach the underside and check the supporting surface before putting the futon away. If a room has nowhere to do that, folding alone will not solve the practical problem.
What should I measure before ordering?
Measure the sleeping area, the storage opening and the space available to handle the bedding. Check the chosen model's weight and folded dimensions rather than assuming any foldable futon will be easy to move. You can describe those constraints to us before choosing HIMARI or SORA.