I was staying in the 100 sq. m apartment with my parents (80 years old) and my son (12 yo). The apartment is very conveniently located to main attractions in Rome. You can walk from it to Colosseum in about 20-25 minutes, and to Vatican in the same amount of time. It is also 5-10 minutes walk form public transport that would take you anywhere. If you plan to be out in the city most of the time, the apartment will be very convenient. The apartment is also close to very good restaurants and shops, and a few doors down the street there is a grocery store. The apartment has two efficient air conditioners that keep it nicely cool during the summer heat.
The owner of the apartment, Carlo, was very helpful with check-in and check-out, as well as transportation from and to the airport. There are many channels of communication with him (AirBnB, WhatsApp, phone), so he can assist you with any problems or questions quickly.
If you plan to spend more time in the apartment, it has shortcomings some of which cannot be changed, and that you may need to know about. First of all, of the three rooms in the apartment only one has outside windows. These windows face a tall wall across a narrow pedestrian street. It means that there is very little natural light that comes into the apartment. People in the street can be noisy. This is especially relevant on Saturday nights when young people stay outside and scream and shout till 4 in the morning.
The kitchen in the apartment is very small and is not really well equipped (no small pots and pans), so if you plan to cook a lot, this may not be for you. The rooms in the apartment are at different levels (this is a 15th century building), and the steps between the rooms made it difficult for my parents to move around. So if you party has older people, have it in mind.