Marco's place is in a fantastic location near the middle of Trastevere, and was very clean and cozy when we first arrived. Marco was not there to greet us initially but he stayed in contact with us the whole time in case we needed anything and his helper Mel showed us the interior and came by personally multiple times when there was anything we needed. He and Marco were always available to help us with whatever we needed.
There are a million different delicious restaurants and bars literally just a couple minutes of walking away, as well as all of the iconic Roman landmarks like the Pantheon and Coliseum can be reached walking for about half an hour or so.
This place is basically perfect for the price but with 2 caveats to keep in mind: the neighborhood itself is party central so expect to hear partying going on outside your window at all hours of the night on the weekends, and the apartment itself is quite a ways up a narrow stairwell so it may not be the best for people with mobility issues.
Whenever we return to Rome we'll be getting this place again.