Federica and Fausto's place is in the most perfect location in Rome. It lies in the heart of Trastevere which you will quickly find is THE place to be in the city. Full of great restaurants and bars within walking distance, as well as the best artisanal gelato you will ever have at Fiordiluna. The area is filled with actual Romans (not only tourists), particularly young people, so there is ample opportunity to "do as the Romans do". The apartment is also within walking distance of such places as the Jewish Ghetto and Campo de Fiori -- two areas we found ourselves in time and time again during our two week stay at this apartment when we did venture outside of Trastevere. The neighborhood is easily accessible from both the Roma Termini train station (via the H bus) and Trastevere Station (via the tram) for fairly straightforward travel to and from airports and other locations in Italy. The apartment is truly accessible from every location you could possibly want to see by both foot and public transit. If you're into exploration as we were, be prepared to walk a lot as there is tons to see around the area of Trastevere!
During your stay, Fausto is usually the one with whom you will communicate, and he is extremely responsive and speaks excellent English. He helped us get to the apartment from Rome Fiumicino (FCO) airport and was very patient and lenient about Check-In. Throughout our stay, Fausto was able to provide us with plenty of recommendations and directions for everything from public transit to where to get the best pizza nearby. I cannot say enough about how comfortable he made us feel during our stay. We always felt like we could lean on him for support.
After you've had an exhausting day of exploring all that beautiful Roma has to offer, Federica and Fausto's apartment is a very comfortable place to rest. As for the space itself, it is quaint and definitely comfortable for two or *maybe* three people. It was a little bit smaller than what thought it would be from the pictures; however, my girlfriend and I never felt cramped. During our stay, we had a couple meals in at the apartment and were always able to relax (and enjoy the air conditioning) without issue. The apartment even came stocked with some drinks in the fridge, coffee and even the makings for some pasta if going out one day was not on the agenda. We had an issue with the Wifi at one point, but Fausto was quick to provide tips to resolve it and even offered to come fix it if I didn't figure it out. The washer really came in handy for doing laundry, and I would advise packing lighter in anticipation for being able to wash your clothes (though you will have to figure out a way to air-dry them). No complaints about the bathroom and shower; plenty of hot water. The other thing that I will mention is that the apartment is on ground level with easy street access. The downside to this is that there is a bit of street noise until well past midnight as bars have outdoor seating only a few meters from the apartment. We were able to get used to this fairly quickly though and didn't have problems sleeping after the first night, and Federica & Fausto provided us with earplugs as extra protection against the noise.
Overall, you can't go wrong with Federica & Fausto's place. You will not regret your stay here!