[gillygize]

Tokyo iOS Meetup organizer here. The place where we meet is a company called Voyage Group, which is actually a proper company rather than a co-working space. It is unique in that, as I understand it, it is made up mostly of small, wholly-owned subsidiary companies, which is why there are all of those different-sized rooms. You are right that it would be good for co-working, too.

Co-working spaces have definitely expanded in the past couple years though. Co-ba in Shibuya and Hub Tokyo in Meguro are two that I have visited that seemed like they had good communities.