"If these girls are lesbian, I would be willing to offer my hotel room for nothing more than to just watch. What is the chance of that happening?"
On the basis they are maids, and therefore not hookers, this is like asking what is the chance of going to the Billion Club and find a MF couple there that would like to use your hotel room for a bunk up with some perv watching them. Would this happen in your country? Why would a lesbian couple (who chose women, not men) actually want a man watching them make love? Reality is often different to the porn you watch matey
If you want some of that action, go to the Gogo bars, tell the mamasan you want two bi girls to put on a show for you and you will get it.