PH Milano would be my #1, as I have stayed there the most and can't beat the location for shopping, the Golden triangle, the Brera District and close by 5 star hotels for aperitif, as the staff always members me.
Out of the following PH's I have stayed at: Washington, DC, Chicago, Former Toronto, Aviara, Dubai, Milan, Mendoza, Melbourne, Seoul, best upgrade was at the Aviara and worst was Melbourne due to the club debacle going back over 6 years ago.