The word sensible is usually used to modify a person.
No, it can equally well be used to modify things, concrete or abstract. A sensible hat, a sensible car, a sensible choice, a sensible plan, a sensible approach to a situation. It just means pragmatic, level-headed, etc, but it has a particular meaning when applied to objects, especially things that are bought or chosen such as clothes, furniture, cars, houses, etc (see (2) below)
Depending on context, one might interpret "sensible" furniture as being dull, ugly, unfashionable, unexciting, boring, etc.
(1) Done or chosen in accordance with wisdom or prudence; likely to be of benefit.
"I cannot believe that it is sensible to spend so much"
(of a person) possessing or displaying prudence.
"he was a sensible and capable boy"
(2) (Of an object) practical and functional rather than decorative.
"My mother always made me have sensible shoes"
synonyms: practical, realistic, responsible, full of common sense, reasonable, rational, logical, sound, circumspect, balanced, sober, no-nonsense, pragmatic, level-headed, serious-minded, thoughtful, commonsensical, down-to-earth, wise, prudent, mature, judicious, sagacious, sharp, shrewd, far-sighted, intelligent, clever.