This is the kind of movie that's most suitable for occasions when you just want something nice to look at, without having to pay much attention and without needing to worry about anything that might jar the senses. It's very picturesque, with many sequences set in interesting and attractive Italian settings. The characters, cast, and story are all innocuous, but they are never especially interesting.
The title sequence is very enjoyable, with the Sinatra song accompanied by many excellent views of Rome. But it sets the expectations a little too high, since the rest of the movie is rather commonplace in all respects other than the settings. The cast is solid, but none of them really get the kind of character that allows them to stand out. The story is pleasant and sometimes enjoyable, but is too often bland, predictable, and/or implausible.
It's still a decent way to pass the time if your expectations aren't too high. It would probably have been a little better if it were a bit shorter, since there is just not enough story material to fill the whole running time without it becoming too noticeable.