The apartment is very well located, less than five minutes from Termini station, from where you can take many streetcars and subways. It's also a 20-30 minute walk from the main tourist attractions, and the neighborhood has some very nice places (the park next door, for example, which used to have open-air movies, or the Gatsby Café).
The accommodation is very inexpensive, and the hosts are very accommodating regarding arrival and departure times! :)
Having a private bathroom is also a great advantage in a shared apartment.
Our stay was very pleasant, and I hope to come back in this beautiful city soon, in such good conditions!