na-adjective, noun
stylish; having great taste
Colloquial wasei-eigo used to praise someone's fashion sense, design choice, or aesthetic judgment. Often said as a light compliment.
wasei-eigo (Japanese-coined English), from nice sense
See also: センス
その服、ナイスセンスだね。
That outfit is really stylish.
彼女の部屋のインテリアはいつもナイスセンスだ。
Her room's interior design always shows great taste.