My favorite thing is alternatives to sleeping lofts.
The simplest is an inverted loft, where you sleep in a first floor room with just
enough room to sit up in, and your living room/ kitchen whatever is located on a platform above your head.
If I did want a "loft", the net/hammock loft has a lot to recommend it from an easy access storage point if veiw.
Simply using hammocks could add lots of flexibility to a space.
An elevator bed that raises out if the way, either automatically or manually, frees up space.
Such a bed could have multiple layers of platforms holding thing's such as a second bunk or a table.
A non-bed related thing I like is the storage stairs that are filled with drawers and cabinets.