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Best answer
13
Old City if culture is 70% of trip — stay inside moat, scooter or songthaew to Nimman evenings. Nimman if work calls daily — airport noise trade-off. Both 10 min apart; split only if you hate repacking.
11
Nimman for work afternoons — wifi cafes everywhere. Old City for sightseeing days. One base only: Nimman + red songthaew to Old City 30 baht.
4
Santitham cheaper third option — 10 min to Nimman, quieter sleep.