I cannot describe enough how convenient this location is to the train station! And it's only about a 20 min walk to the sights in the heart of Rome if you don't feel like taking public transportation. Francesco and Accomodalia are great hosts and keep the apartment very clean. They were also great about accommodating our arrival/departure schedule. Note that though the apartment is spacious, there isn't really a common space to hang out in that's not part of one of the bedrooms, so this apartment is best for people who want to use it primarily as a place to sleep and not have a lot of down time there. I don't say this as a complaint, just as a note for what to expect.
AirBnB messages and/or email are fine for communicating with Accommodalia ahead of time, but when it gets close to the trip, I recommend connecting with them through WhatsApp.
Great place, I would book it again in a heartbeat!