My wife and I stayed at Alessandra's place for a week and overall it was a perfect time! Let me specify:
1. The house.
Located inside a yard, the house is clean, fully complies with photos, full of everything traveler might need (and if you have a special requests - you can just ask). Everything works correctly, wi-fi is fast.
2. Location. Before the trip we read a little about Pigneto and expected to see a place for young locals, something similar to Neukolln and Kreuzberg in Berlin. And, actually it's just like that. No crowds of tourists, nice bars and restaurants in a few steps, locals are friendly and nice. As in my opinion, the food experience in cafes around is one of the best in Rome. Authentic, yes!
15 minutes to Colosseum by bus, but it's nice to take a walk. Also, there're bikes that you can use.
3. The host. Alessandra was super welcoming meeting us from the train at Tuscolana with her car, so we didn't care about our luggage. She provided us all necessary information and advices about the area and the city. When we asked, she brought us an iron the same day. Overall, we felt like we can ask her about anything.

We enjoyed our stay and would deffinately recommend staying here when in Rome. Thanks Alessandra!