Loft bed from the Swedish company Compact-living. The concept is particularly great for a small or tiny house because it eliminates walls below. While the ladder doesn't look super fun to use the lighting and bed solution is innovative and fun.
Walk in wardrobes are symbols of luxury and the pride of some homeowners who have a well organised designer walk in wardrobe. Sometimes what goes against such walk-in wardrobes is that they take away significant space from your room.
a recessed nook becomes a headboard for the bed. I think I'd take the nook all the way to the ceiling to avoid it looking like you put the bed in a repurposed closet; and put the ledge up higher, so that you can recline against the wall