I have used Airbnb a lot, and Kerstin is the best host I've ever had. Her communication is excellent and she was very welcoming. When we arrived she took us to the grocery store, showed us around the neighborhood, helped us buy metro tickets, and had an espresso with us. She also offers "taxi" services, which we were very grateful for because we had to leave for the airport at 4:30 in the morning. The apartment is an excellent value and is as shown in the pictures. There is a rooftop as well. The only potential downside for the traveler is that you are staying a bit out of the center (30 minutes by tram with two blocks to walk) though it is convenient from the airport. But I prefer this, because it is quiet and the value is better. The tram #8 is very easy to use and it takes you close to the Roman Forum.