It's perfectly acceptable to say 'neat' about someone as a positive adjective and most people will know what you mean. However, the term is socially outdated now, having been replaced now by 'cool'.
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AnonymousHi, can I say 'neat' about somebody generally ?Yes. He is neat. She is neat. To me it suggests, in its non-slang meaning, someone who is clean and tidy. In its slang meaning it suggests someone who is admirable and/or clever.