The apartment is modern, clean and you have all necessary amenities. Everything was like described even better when you get there. For me the location is always one of the most important things while staying in bigger cities. This apartment is 3 min walking to the metro station San Giovanni and also 3 min walking to the metro station Re di Roma. If you want to visit Pantheon, Fontana di trevi, Piazza Navona, Altar of the Fatherland, Colosseum, Roman Forum, Palatine Hill you need just one bus (N 85) which is stopping in front of the building and will get you to all of this attractions.
Vatican city and the St. Peters basilica (btw i highly recommend the basilica) is 9 stops away form the apartment.
I didnt get to meet the hosts, but they seem to be very friendly and our communication (through airbnb) was fast and without problems.
I highly recommend this apartment.