Alessandra's apartment is in an amazing location - very close to trendy restaurants & bars in Ostiense - and very safe. It's a short (15 minutes) walk to Testaccio & another 15 minutes to Trastevere. We walked to the Vatican one day from her apartment and it took about an hour. The weather in Rome is amazing (compared to the UK) so we didn't mind the long walk.
The apartment itself is very clean. The pictures aren't 100% accurate. The lounge is smaller than shown with no couch. It had another bed in it at the time. Also the bed in the bedroom is smaller than the picture indicates. It was a double and also a bit uncomfortable (too hard).
Overall, Alessandra communicated very well before and during our stay and her flat was fine for our long weekend in Rome - with just a few things that didn't meet expectations.