Suggestion, after the server successfully created, show the command that they can execute to access the server (ssh root@<ip>, with <ip> being replaced with the real ip).
We've had several people suggest making this more prevalent and it's on our todo list :)
I haven't used your service yet, but if I understand the limitation correctly (only github logins/only one server per login) I think it should also be possible to automatically derive a subdomain name from the github username and have that point to the server. Not sure if that's a good idea, just throwing an idea over the wall :-)