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I'd go for "listening now" or "currently listening". I also assumed the "room" was the what I see now is called "station".

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".

Fully agree with everything you said!

"In the room XXX" really confused me because I thought I were in room XXX. (There's at least a colon missing after "room"!)

I love "listening now", just changed it!

I like in the room - I agree it is cozier - in the cafe as suggest below is also nice

I like the "room" terminology. Maybe just make it clearer that it's not a room number, but the number of people hanging out in the room with you?