For "tidy" or "organized":
* Orderly
* Tidy
* Spick and span
* Immaculate
* Clean
* Well-kept
* Uncluttered
* Shipshape
For "stylish" or "elegant":
* Chic
* Smart
* Dapper
* Sophisticated
* Elegant
* Polished
For "clever" or "ingenious":
* Ingenious
* Clever
* Smart
* Resourceful
* Brilliant
For "pleasant" or "enjoyable":
* Delightful
* Nice
* Pleasant
* Wonderful
* Splendid
For "small" or "compact":
* Compact
* Miniature
* Tiny
* Trim
The best word to use will depend on the specific context.