This gorgeous basement flat was very well located--it's near to the tram, subway and bus lines, and a short walk from Termini train station. The fact that it's right beside the Colosseum means that every time you leave you have this awe-inspiring view. The flat itself was beautiful and clean, and the pillows provided were very lush.
The check-in process was amazing--extremely well thought out and rehearsed. They even gave me a bottle of wine! Knowing that I wanted to eat my way through Rome (who doesn't), they also gave me a bunch of food recommendations that were really good.
Do note that because it's in the basement, you'll occasionally get the sound of people talking or cars driving by. It's not particularly loud, and the street itself is a fairly quiet street, but it's there from time to time.