General synonyms:
* Neat
* Tidy
* Organized
* Methodical
* Systematic
* Disciplined
* Regular
* Well-arranged
* Structured
* Efficient
More specific synonyms:
* For a person: Well-behaved, disciplined, punctual, reliable
* For a place or thing: Clean, arranged, neat, well-maintained, systematic
* For a process: Systematic, methodical, efficient, streamlined
The best synonym will depend on the specific situation and the meaning you want to convey.