Rotating and Corner Units in a Small Room
Corners and narrow gaps are where storage in a small room is usually wasted. Two shapes of unit are designed for exactly that problem.
Rotating towers
A rotating unit gives you access to four faces from one footprint, which is genuinely efficient in the middle of a room or at the end of a run. The trade-off is that it needs clearance all the way round to spin, so it cannot be pushed into a corner.
Narrow towers
A tall narrow case turns an awkward half-metre of wall into real storage. Because the footprint is small, wall anchoring matters more here than anywhere else.
Think about reach
Storage above shoulder height is for things you use rarely. In a small room the temptation is to go as tall as possible, but the top shelf of a very tall unit is only useful for archive.
Leave a gap
Furniture pushed hard against a wall in a humid room traps air. A centimetre or two of clearance behind is worth having.