They do lots of things. For instance, our butler just arranged a last minute cocktail party in our suite for 5 friends plus us. He brought drinks, beautiful and extensive canapé selection and “atmosphere “ in the form of electric candles. He also took my broken shoe to the workshop to be repaired. He found a particular bottle of wine for me to have in our suite. He changed dinner reservations for us last minute. I could probably have arranged some of these things myself but with considerably more effort.