To me, the ability of the staff to discern when to "pull back", when to "become invisible", factors into the luxury service equation. I don't stay at true luxe properties often, but when I do staff attitude has made all of the difference, in my great stays (FS in Berlin, RC in Wolfsburg, Baglioni in Bologna) and bad (L'Europe in Amsterdam, a lovely physical property in the perfect city locaton ruined by haughty, uncaring, inept service).