This was our very first airbnb ever. I was a bit nervous, but after looking at the choice of hotels, I decided to take a chance. Honestly, this place looked too good to be true. My mother, who lived in Italy for nearly 10 years, warned me against renting this place, because so many people come to see the Trevi fountain, there is constant noise into all hours of the night. She assured me we wouldn't like it. She was so wrong. Sure, when you open the windows, it's like being at a baseball game covered by a rush of waterfalls. What's not to love? But four flights up, the noise is tempered, and the windows are double-paned, so when closed, the only thing you really hear is a dull hum, unless someone gets proposed to at the fountain, and then the crowd cheers at once. (Which is so fun to see and hear.) But we loved having the windows open, watching the people and the fountain. We loved every second of the noise, and can't wait to go back.
Pros: The view. It sleeps four fairly comfortably. There are two bathrooms, which helps when you're traveling with more than two. Small kitchen, well-equipped. Plenty of restaurants around, and the Forno market just around the corner, where bargain prices make your meals affordable should you choose to eat at the apartment. Four flights of stairs ensure that the gelato you eat from the many shops surrounding you will be worked off, soon.
Cons: Four flights of stairs. Pack light. I had to take a traveling office with me, so we had more bags than we should to travel with. If you can't do stairs, don't rent. Noise. If you're a light sleeper, you don't like noise, crowds, etc., consider renting elsewhere. I am a light sleeper, but I loved every second there.