As far as i know private spaces are part of Heroku Enterprise and prohibitively expensive for most startups.
I'd love to hear more about your use case and what I could do to improve the situation. You can contact me with the email address in my profile if you're interested. Thanks!
We'll have a new location in Singapore in the coming weeks/months. But if I understand well, it's not enough for japanese users?
A Singapore location would be incredibly useful for me. Is there some way to get a notice when that becomes available?