Our stay at Nina's apartment was overall very good, and it was definitely value for money.
The area is close to both Roma Termini and Colosseum/Piazza Venezia (the central hub of Rome) so it made it easy to walk around. Also, the address is known to taxi drivers.
The flat was convenient for 4 of us and we had everything we needed. I would say that for Italian standards it was very well equipped as well. As we stayed 7 days, we needed some extra towels and this was not a problem to Nina and we got some more during the stay as well.
We had very good communication with Nina from the beginning and her son Luigi was available on WhatsApp for all needed during our stay. He waited for us when we have arrived (20 eur extra; regular taxi is 48 eur).
WiFi is not so good - sometimes it didn't work and this was probably the biggest minus beside the noise from the people living above (this has nothing to do with Nina though).
Overall, it was very good stay and value for money. Also, description is quite accurate and you can rely to photos and what has been offered.