These adapters are super cheap and high wattage. They work for hair styling devices and are inexpensive enough that you can put one in every room.
Unidapt European to US Plug Adapter 220V
A converter changes the voltage so your American devices run on 110V while the outlet is providing 220V.
Power Converters
I haven’t seen many of these in town, so best to bring them with you. Many of the walls are stone or masonry, so drilling to hang things can be tricky.
Heavy Duty Command Hooks
Rugs are not as much of a thing in Italy especially. Bring one to avoid cold feet on the tile floors.