ショウ, とこ, ゆか
bed, counter for beds, floor, padding, tatami
JLPT2 G7 S7 F1175
广 here a variant of 爿# long, wooden sleeping pallet + 木 tree/wood → *bed* (compare 牀) → *floor*; *stool* (← things on which it is possible to sleep) → *ground*; *stratum* (← "bed" in figurative senses); *alcove* (← shelf board shaped like a bed/sleeping pallet) → *barber* (← stool on which a customer sits while having his hair cut). *Tasteful* and *elegant* are borrowed meanings.
[Full Kanji Etymology List]