This is the first time we (4 people) rented an apartment instead of using a hotel. So I was apprehensive about potential discrepancies between what you see in the pictures and what you get in reality.
After spending 5 nights there in September I can testify that it is as beautiful, luxurious, and spacious as it appears in the pictures and more. All the windows are double glazed making it very quiet. There is a central air-condition system covering all the apartment turning hot nights into pleasant ones. There is a separated heating system but we never used it. The kitchen is small but very well equipped.
The apartment is on the fourth floor but with a newly installed elevator that worked well during our week. The WI-fi worked well but only in the bedrooms not in the living room.
Location: centraly but on a quiet side street and in a pleasant upper scale neighborhood. 3 minutes walk to Barberini metro station and many buses. Les than 10 minutes walk to the Spanish steps or the Trevi fountain. And just as important 4 minutes walk to a nearby supermarket that is open till 20:00 and on Sundays. There are also many good restaurants and shops nearby. We specifically recommend the Osteria Barberini on the same street only few steps away from the apartment.
Communication with owner: Exelent, Coco always responded fast and with clear and precise answers. She offered to help us with transportation to the airport and we used it twice. At both times a chauffeur in a brand new Mercedes came promptly on time and cost us less than regular taxi. And lastly when we offered to pay for a very late checkout (19:30) it was accepted free of charge.