The brothel doesn't seem to work as intended. When talking to Madame for the first time, she does nothing but give you access to her establishment, allowing you to go to Maria and rescue her without paying any money.
It's not possible to "use" the service.
I'm not quite sure, if the brothel was somehow censored in English JA2 Gold? I guess, that this is an issue not introduced by Stracciatella. Maybe, Stracciatella could revert this back to normal (=working) behavior, though?
I've attached a savegame just before talking to Madame for the first time.