Excellent overall experience!
a) very clean, b) great location, c) I felt safe in the neighborhood and in the apartment, d) quiet. Everything I needed for my trip to Rome.
Costanza was an excellent communicator and host. She provided excellent tips, maps and even loaned me a book on Roma to use during my stay. Check in and Check out were very easy.
Worth mentioning after a long day running around Roma: this Airbnb has an amazingly good shower! Highly recommended.