Here's the run-down so far to help others in Boston who may be looking:
Boston Photo Co-op: as John said, toast. Too bad, the people who have used their JP space liked it.
NESOP: Expensive, but very clean, generous hours, max format size 4x5", no JoBo.
LaPete: Lots of good equipment, unfinished space with serious dust control issues, plumbing incomplete, so lots of back and forth to get tempered water, etc. Very cluttered. Runs his JoBo dry & cold, so subject to temperature drift during processing. I'd like to support him, but the setup is not encouraging.
Danforth Museum School: (did not visit this one yet) Open darkroom is listed in summer catalog, format limited to 35mm only.