US two-way radios are illegal in Europe as they use frequencies assigned to other services. Chances are you won't disturbing anyone, but if your transmissions spill into some assigned frequency and somebody does complain, they will send post police after you and you risk being given an hard time. I have seen with my own eyes the post police car with a rotating antenna looking in the centre of Florence for an unauthorized transmission that triggered a bank alarm (I saw also the end of the story: it was an official TV operator that had wrongly set up his gear, without realizing he was near a big bank vault).
By the way, do not trust people in forum writing: we brought the radios, used them and nothing happened. The same rogue transmitter may be unoffensive in open country and be a nuisance in a city. A frequency that sounds free most of the time may be in actual use; a frequency sounding free in a place may be busy somewhere else.
In a typical twist of Italian law, local walkie talkies are free to buy, but you need to notify authorities in writing before using them and pay a small tax.