More context needed.
ρέστα means “left overs” or “loose change”; it’s from Italian and corresponds to “(the) rest” in English.
In this context, though, if what they said was
I go to my ρέστα room, inside to καμπίνα
I’m suspecting it’s a borrowing of rest room, given that καμπινέ (< French cabinet) is a word for “toilet”.
Hm.
Given the context of the song in the movie Rembetiko (film), you might want to reconsider. Then again, I dunno, maybe not: my fellow Greeks who have also answered the question don’t seem to be bothered. It is about how Greece does not take care of Greeks, like a mother mistreating her children, and is instead distracted by illusions of ancient grandeur. In the movie it alludes to the collapse of the Megali Idea. Which happened in Turkey.
It’s a great song, and it’s a very political song. But while Greeks can be very self-critical, they dislike hearing the same criticisms from others, and I’d think Turks repeating those criticisms could be a bit much.
Here’s my translation btw: That Big Fake Talk
My opinion notwithstanding, I’m very happy to hear of your tour, and I wish you all success. I’d say it in Rumeyka, but I’d get it wrong…