The contact with Lucia was easy, she answered all of our questions and checked if everything was ok when we were in Rome.
The flat itself was ok for 2 as we didn't spend much time there. It is very clean, we even had towels provided by Lucia! Transports are very close and easy, and if it's not too hot you can always walk to Termini in about 20minutes.
The breakfast was simple but good, it was enough for a week. Don't forget that there is no gas to make warm dishes. So we ate outside, there are quite cheap but very good pizzerias near, it is a calm neighbourhood but you can find bars and a more lively piazza in San Lorenzo, which is 5-10mins away by foot.
The only negative aspects were the trains which wake you up early in the morning if you don't close the windows and the low wifi connection.
Grazie mille Lucia, we had a great time!