The appartement is in a great location, the Vatican is reachable by foot in less than 15 minutes and there's a 24hour supermarket very close by. If you prefer going by Public transport the connections a very good with a train station only 2 minutes away and a bus connecting the appartement with the inner city and termini station; even late at night.
Moreover Elena was a great host and helped us immediately with a problem we caused and came over to fix it. She answered quickly to our messages!
The appartement itself is small but lovely, clean and has enough space for two people.
We would definetly recommend booking her appartement when in Rome and will do so ourselves when we come back!