Hi Gianni,
Tivoli is a beautiful town we enjoyed our stay there, during the day looking down across the countryside towards Rome was usually very hazy, I remember the earthquake which was sad for such a picturesque town. Rome even back in 2016 was very bright on the horizon, above I could only see 4 or 5 stars, in Rome none, the air pollution in Rome seemed very bad. From our hotel balcony we could see several towns all was very bright and it seemed no light pollution control.
British Astronomical Association
Supporting amateur astronomers since 1890