When we stayed in Rome in early October before our westward Transatlantic cruise, there were no COVID requirements either--masks, spacing, proof of vaccination, etc. Our cruise stopped in Toulon, Palma de Mallorca, and Cartagena and it was like Rome--no requirements. Some photos of maskless tourists during our trip for your inspection:
Colosseum Tour
Dinner at Da Enzo al 29 in the Trastevere district in Rome
Early morning at the Pantheon
Lunch time at Palma de Mallorca