Marcella's place was in a great central location within walking distance to all the major sites. I was with my 73 year old mother and she was able to handle the 3 flights up without too much of a problem. In hindsight, I would have put more consideration to this as those flights of stairs can be tough after a long day of walking. We easily walked to Piazza Navona, Trevi Fountain, Spanish Steps, and the Pantheon. We did a tour that took us to the Vatican in a bus, and we Ubered to the Colosseum then walked back to the apartment stopping to have lunch in the Jewish Ghetto. I wasn't brave enough to figure out the bus system. We used Uber to get us to Roma Termini to catch our train at the end of the trip and they met us right in front of our building.
The apartment was clean and cozy with great WiFi. We cooked frequently in the kitchen and I made espresso in the Moka Pot, but Marcella also provided coffee pods for the Nespresso machine and tea as well. The double-paned windows blocked out the bulk of the street noise so we didn't have to use the provided ear plugs, but if you're a light sleeper you may need them, or headphones.
Marcella arranged our pick up from the airport with a private driver who was friendly and great about helping my mom with her bag. Also, Marcella was very sweet to carry her bag up the stairs when we checked in. She provided a map of the city and instructions on getting around. It was a great place to stay and much less expensive than a hotel for four days!