Perfect location right next to Trevi fountain, meaning that all major sights are within 20mins walk. Despite the central location also completely quite as it directed towards an inner courtyard. Furnishing is decent and includes everything one needs, cleanliness of e.g. the shower could be improved.
If you think about staying multiple nights be aware of the following aspects though:
1) The apartment overall is relatively small and with only limited daylight
2) As some other travelers mentioned before: The mattress is very soft/worn out and could be changed for a new one.
3) Check-in goes smoothly once the right contact is identified. We tried to contact Guilia but were not able to reach here until a couple of hours before check-in. Once Edoardo, a colleague of hers, was given to us everything went fine.