Pros: Good location. Walking distance to St. Peter's and Vatican museum. Short cab ride to other areas of interest. Relatively cheap and fit our family of 4 easily.
Cons: Host was not at the unit at the check-in time we arranged. Had to have a local call him for us and then wait until his brother arrived. Also, the shower only gets luke-warm and there is no place to hang the shower head, so you will need to hold it yourself the whole time.
Overall: Given the relatively low price, I was still happy overall despite the two cons mentioned.