I booked a girl through an agency, said she does "classic service?" Any idea what that means? Asked if it was gfe, but something seems to be lost in translation. Agency based in Europe I think.

1.  "Classic service" does not have a useful definition here in northern California.  I don't know whether it does in Europe, but I doubt it.  
2.  Even terms with well established definitions like "GFE" are frequently used in false advertising.  
3.  Hence -- TER!  Read her reviews for a better chance (not a certainty) of expecting what you'll get.