My wife and i stayed for 3 nights in Giorgia's apartment in late June. It was absolutely perfect for our needs, and we think it would also suit a larger group as there is another good size bedroom for another couple/children. The kitchen and bathroom are perfect (we did not cook any meals of course, when you have a hundred restaurants on your doorstep - and although the pictures do not show the bathroom, I can confirm it is also perfect, spacious with a good shower).
The flat remains naturally cool in the summer so we didn't need to use the effective A/C very much despite the 30+C summer heat.
It's also very well located near the two main squares of Navonna and Campo di Fiori. And although it is very centrally located, it is very quiet because of the excellent double-glazed windows and solid structure. It is on the first floor so not many steps, but there is an elevator too if you need.
Giorgia was quick to reply to any questions, in a friendly manner, and everything went very smoothly at check in and check out, and she also allowed a little later check out for us, so overall we can only say this was so perfect for our stay in this incredible city. We will always come back to this apartment when visiting Roma!