Thanks to Gian Marco and Nicole, they were a perfect host. Very accomodating and nice. You can trust them if you need help, they will be happy to help you.
About the apartment : very good location (2min from the metro station, 5 for the colosseum and you can go to the city center by walk), clean place, well decorated. In short i recommand this place, my friends and I are so grateful, we had a really nice week end in Roma !