Amazing location- you can see the Vatican from your bed, and there is a bus stop right outside the front door!
I would suggest bringing earplugs if you have a hard time sleeping, the proximity to the Vatican and city center means you will hear church bells very early in the morning and cars very late at night. Also, pack light because the apartment is up several flights of narrow stairs (however you should expect this most places in Europe). Claudia and Marco were exceptionally helpful and quick to respond. We had an amazing romantic couple of nights here and were very pleased with our stay! 10/10 would recommend.