Rooms near Singapore Science Park I & II and Kent Ridge. Popular with researchers & postdocs. Quiet units, longer leases, minutes from the labs.
Rooms near Singapore Science Park currently list from about S$800 to S$1,350 a month (most commonly S$1,200), based on 11 live listings on SGLinkUp.
Kent Ridge MRT is closest to Singapore Science Park. On SGLinkUp you can sort every room by commute time to Singapore Science Park, not just distance.
Both appear on SGLinkUp, and each listing tells you which. You message whoever is listing directly on WhatsApp; any fees are agreed with them.