Federica is a great host with a lovely apartment. She let us drop our stuff off when we arrived in the morning which was a real help on a hot day.
The location can't be beat, minutes from the Trevi Fountain and the Spanish Steps and a 5 minute metro ride to Termini.
One thing to note is the bedrooms are overlooking a side street and there can be a bit more of noise, but nothing out of the ordinary and it quieted down later at night.
Overall would highly recommend a stay here, for the location alone!