Hello, emma, and welcome to Just Answer.
Perini is an area near Rome, and it is near the Vatican museums. I cannot find a "San" Perini. Could the fact that it is a suburb of Rome be what you're looking for? Perini is also an Italian surname.
Here is a link to a website of a bed and breakfast in this area:
I hope this helps, but please let me know if you need further information. Or, please provide me with more about you need so I can find the answer you want.
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