Gypsy housing used to be the mecca for this kind of activity. They changed the name (reasonably so!) to Ghostlight Housing, but it looks like it was suspended b

Gypsy housing used to be the mecca for this kind of activity. They changed the name (reasonably so!) to Ghostlight Housing, but it looks like it was suspended by an admin in 2022. If you generally search the web for "NYC housing facebook groups", those keywords will lead you to the right groups. Note you'll probably have an easier time searching for these groups with Google than with FB. And don't be intimidated by private groups, the barriers to entry are really low. There are niche groups for artists, craftspeople, etc. if that appeals you – just add appropriate keywords!