Visiting Marco was my second Airbnb experience. Marco was a helpful host that gave us a lot of information upon our arrival for what to do in Rome.
His apartment was pretty clean and nice with a comfortable bed. Also beneath the house there was Marco's pastry shop where you can have coffee and breakfast (a great way to start your day in Rome).
The house is like 5 minutes from a metro station that can take you to center of Rome (you can also walk there but it takes 20+ minutes). A bus station also in front of the house that can take you directly to the Vatican. The area has some good places to eat (pizza and gelato) and it is also close to Trastevere (15 minutes walk).
The only negative is that the room we were given had some air vents near the window which made it a bit noisy most of the day but if you keep the window closed that won't be an issue.
I would highly recommend Marco's place for anyone that isn't looking for a place in the city center.