I have managed to pin down a few answers to this question. Doing some research and other sources I seem to have come up with the following answers:
1- As of now, several countries in the European Union, such as Italy, France, Spain, and Portugal, have regulations that require hosts to provide an energy performance certificate for their property to guests. However, the enforcement of these regulations may vary, and it may not be a requirement for Airbnb to display these certificates on their platform.
2- Law 90/2013 is a law in Italy that transposed the Energy Performance of Buildings Directive (EPBD) into national legislation. The EPBD is a European Union directive that aims to improve the energy efficiency of buildings across the EU, by setting minimum energy performance standards for new and existing buildings, and by requiring regular inspections and assessments of the energy performance of buildings.
The Italian government transposed the EPBD into national law with the passage of Legislative Decree No. 63 of 4 June 2013, which amended Legislative Decree No. 192 of 19 August 2005 on energy performance in buildings. Law 90/2013 provides additional guidance and regulations related to the implementation of the EPBD in Italy, including provisions for the energy certification of buildings, the promotion of energy efficiency in the construction sector, and the development of national plans for improving the energy performance of buildings.
3- Starting from December 31, 2025, all buildings in Italy, both new and existing, must meet the minimum energy performance requirements established by the European Union's Energy Performance of Buildings Directive (EPBD).
The minimum EPC rating required for buildings in Italy will depend on the building's use and the year in which it was constructed or renovated. However, the Italian government has set a goal of achieving a minimum energy performance rating of class B for all buildings by 2030, in line with the EU's climate and energy goals.
The correct minimum EPC ratings for buildings in Italy from 2022 to 2025 are as follows:
From 1 January 2022: minimum EPC rating of class F
From 1 January 2023: minimum EPC rating of class E
From 1 January 2024: minimum EPC rating of class D
From 1 January 2025: all buildings, both new and existing, must meet minimum energy performance requirements, which are yet to be defined.(my guess is it will be C)
These minimum EPC ratings are based on Legislative Decree No. 28 of 3 March 2011, which sets out the minimum energy performance requirements for buildings in Italy. The decree was subsequently updated by Legislative Decree No. 63 of 4 June 2013, which transposed the Energy Performance of Buildings Directive (EPBD) into Italian law.