Silvano is a great host. Before and during our stay at his place he was very helpful. Upon our arrival in Ostiense he picked us up with his car, invited us in one of the best gelaterias in Rome and showed us around in Testaccio. Testaccio is good place to stay if you don't mind walking a bit to get to the sights (around 30 minutes to the center of Rome). In my opinion it's an advantage to stay away from the touristy center of Rome and if you don't like walking you can go by bus (the bus stop is directly in front of the house) or tram or metro (Pyramid station), which is very cheap.
Our room was very comfy and clean. You share the flat with Silvano's sister and some other guests. We felt very welcomed and had everything we needed. We would definitely stay here again!

For those who have to catch an early morning flight: The best way to get to the Fiumicino Airport is by T.A.M. Bus. They transfer between Ostiense station (10 minutes walking from Silavno's flat) and the Airport, costs 6 € and the transfer starts at 4:45 a.m.