It's the current visitors. I liked the word "room" to make you feel like you're in good company, but maybe it'd be better to just write "live now". What do you think?
Counting the listeners in a station instead of visitors site-wide would be kinda neat though, and "room" works well then I think.
edit: or maybe "in the cafe" for site-wide visitors? That should be clear and has the same feeling as "room".
"In the room XXX" really confused me because I thought I were in room XXX. (There's at least a colon missing after "room"!)