Our apartment was simply perfect, also for 4 people. Not too big, but convient for sleeping after the full day sightseeing. The location is one of the best, the Cavour underground stop is 10 m from the flat, which is convenient and not noisy. The Colosseo is just 5 minutes walk, you can simply walk in the city without using public transportation. Termini train station is also just 15 minutes by walk from the flat.
The flat was clean and well equipped with towells, pillows and blanket.
Our host was helpful, the communication was easy, and they were at the flat to welcome us in time. I can reccomend this flat to everyone.