Lots of good info at
https://www.westinstjohnownersinfo.com/ thanks to
@alexadeparis.
Virgin Grand/Hillside - across from main resort studio/1 BR/2BR units up hill with separate pools & 3 BR with their own pools at bottom of hill. Have full kitchens with real ovens and you can park by your unit. Freecycle container for items passed down from other guests just up hill from 3 BR villas - this is the only phase with access to the Freecycle.
Bay Vista - furthest from beach/pools and a long walk from parking/taxis. Kitchens have microwave/convection ovens. Kind of far from pool/beach without the benefit of parking by unit.
Coral Vista - just up the hill from Sunset Bay. Kitchens have microwave/convection ovens. 2 BR Lofts cost the same as regular 2 BRs. In Platinum and Gold Plus season, some of the 2 BR and studio units cost less than the listed amount on StarOption charts because they are the portions of the 3 BR LOs; the 2 BR and studio units that are not part of the 3 BR LOs will cost the listed amounts. This can get you a good deal on a 2 BR, but you have to look for the ones that don't list the amount from the table. It's a bit of a quirk in the valuation of those units for StarOptions.
Sunset Bay - old hotel units converted to studio, 2 BRs, and 3 BR LOs. Closest to pool/beach. Kitchens have microwave/convection ovens. Buildings 10 & 16 have best views of bay as they are closest. Kitchens have microwave/convection ovens.