Overall, I cannot recommend this apartment. A few pros, but mostly cons.
First the pros: Willy, the host was friendly and reasonably easy to reach. Check-in was smooth and he gave good and useful recommendations for shopping and restaurants. Willy also responded to our request for a toaster and dropped it off the next day. We tried to coordinate a laundry pick-up with him (no clothes washer in the apartment) and that was unsuccessful but in fairness to the host that was in large part because we were gone for most of the day.
But the apartment has many, many issues which were clearly illuminated in our week-long stay and that is why I cannot recommend this place.
At the end of a long day of sightseeing, especially when traveling with children one would like a nice, comfortable and clean apartment to return to where one could unwind and relax. That simply was not the case here. The apartment is for lack of a better term, very sub-par. Then host appears to have made minimal effort to make the apartment appealing. I would suggest the following changes: Renovate the entire apartment! The apartment is not well-maintained, and not clean at all. There are cockroaches. The current furniture is old, cheap and not comfortable. It needs more seating in living room, currently there is only small torn sofa which seats just two people. The “dining table” is more like a card table, very small. Then bathroom does not even have a towel rack. There is only small hook for hanging clothes, towels, etc. The water pressure in the shower is very poor, almost dribbling out at times.

The Colosseum is right near the apartment (one block away) and there are several good restaurants on the same street. However the entire area was somewhat rundown and not clean. There were several large city garbage dumpsters on the street overflowing with garbage. The city did not appear to be in a rush to empty them as they remained overflowing the entire week we were there. If I were ever to return to Rome I would not stay in this area again and certainly not this apartment.