Corriere della Sera explicitly reported Lady Gaga stayed in a suite at Hotel Principe di Savoia in October 2012, The Guardian independently identified it as where she was staying, and Glamour published contemporaneous departure photography.
Lady Gaga stayed at Hotel Principe di Savoia during her October 2012 visit to Milan for the Born This Way Ball. Corriere della Sera explicitly reported that she stayed in a suite at the hotel, while The Guardian independently described the property as the hotel where she was staying. Contemporaneous photography published by Glamour shows her leaving the named hotel.
Source conclusion:
The cited sources support a stay at the named hotel.
