We have been 4 persons in Andreas' apartment which is conviently located just south of Ostiense train station. The local train from Fiumicino airport to Ostiense took 32 minutes. From there you take the underground crossing to Eataly and some minutes to the apartment via Via Gerolamo Benzoni. The apartment was found clean and beds were made. The kitchen is fully equipped but could have some more tea spoons and forks. The description of the apartment is exact.
Unfortunately Andrea could not meet us upon arrival but he sent a very friendly young lady who explained everything to us. The apartment is located on the 5. floor with a lift and a balcony facing the east with a canvas blind against the sun. The entrance to the house lies in the back of an open court. Even if the street is rather quiet light sleepers should bring ear plugs since you might hear a dog barking, people talking, a scooter passing, .... You are in Rome, in Italy!
Just around the corner you will find a coop supermarket. At the corner of Via A. Pigafetta and Via Gerolamo Benzoni there is a little bar where you can get a cafe (Espresso) for 1€ and even a Capuccino for only 1,50€ (delicious and hot). A very good place to start off the day in Rome. In other places I paid more than 3€ for the Capuccino and it was only lukewarm. Around the corner you find a bus stop to Piazza Venezia or a bit further down south near a white modern bridge there is the metro station Garbatella via Circo Massimo, Colosseo, Termini,... You are near Testaccio or one stop by local train you reach Trastevere south where you can take the Tram to Trastevere north. All in all the apartment is off the beaten tracks but confiniently located concerning the public transport in a Roman neighbourhood.