What a gem! The apartment was really nice, right off piazza Trilussa. Andrea, Laura's husband, welcomed us with a smile even though we were a bit late. It was really clean and there were nice touches, like flowers and wine and beer in the fridge. There were basics for cooking. No stove or toaster, but we managed to cook nice meals. The bed was comfortable, the sleeper bed a bit less, according to my son who slept on it. There is often singers on the piazza and a crowd that gets pretty noisy on the week-ends, but the windows are pretty efficient at blocking the noise.
Trastevere is a really nice neighborhood and gets very busy at night. Lots of restaurants, bakeries and bars. We mostly walked everywhere, but the Colosseum/Forum and the Termini are a bit far (35-40 min walk). You can take the bus on the corner of the street that will brind you to Testaccio and the Piramide metro station, and several trains leave from there (to Ostia Antica or Fiumicino, for example). To get to the apartment from the airport, you take the L1 train to Trastevere station, then a tram that stops 2 blocks from the apartment (you have to get out of the train station, buy a ticket at the newspaper kiosk and then head to the tram stop on the other side of the street).
Laura replied to my questions really fast and we had no problem whatsoever during the week. Easy checkout too. Very good place to stay!