The flat is in a great location, a couple of minutes from Piazza Navona. Lots of restaurants and bars nearby. It's a good sized flat with a kitchen if you did want to cook yourself.
The AC is in the living room. The bedroom has a fan but can get hot at night.
The main downside is that the flat is on a square with lots of bars and clubs so it can get really noisy at night. Definitely do not stay if you are a light sleeper. I didn't consider myself a light sleeper but I found it quite noisy too.
Marcella is easy to contact and replies very quickly.
Also note that these is an extra fee (€40) to be paid in cash for cleaning on top of the service fee. It's been listed as a flat fee for 'consumption' which I interpreted as if I used the food and drink provided, but it's actually for cleaning. In total I paid over €70 for cleaning, and additional for city tax which I found too expensive. There is a sign in the flat asking the guests to take their own rubbish out which I found a little unreasonable given we are being charged so much for service / cleaning.
Overall a good stay.