Marco's place was perfect for what we were looking for in Rome. It was easily the nicest and most unique Airbnb we stayed in during our 2 weeks in Europe.
His son was very helpful in checking us in and giving us a rundown of the city and multiple recommendations. The communication was great, and they even surprised us with a bottle of champagne.
The place itself is very clean, with comfortable beds (1 queen in bedroom, and a very comfortable pullout couch) and a good shower. The highlight is absolutely the rooftop. The pictures won't do it justice. It overseas the coliseum, is a massive private space, and was the perfect spot to drink espresso on in the morning and beers late at night.
Finally - location is solid. It's a 5 minute walk to the coliseum and 10-20 minutes from numerous city monuments. Do note that the Vatican and Travesterde (nightlife spot) are likely a cab ride away though.
That said - don't think about this one. Just book it and thank Marco later.