'Il Vicolo' simply means 'The Alley'.
http://it.wikipedia.org/wiki/Vicolo
There are probably dozens of such streets and passageways dotted around Italy. Further, as Rocky states, it's a popular name for restaurants around the world. There have been various paintings with that title (but none of any great significance) and there was even a famous racehorse with that name. So, without some further information, it's unlikely that we'll be able to offer an answer.