The appartement is really nice and well-equipped. Giuanluca was very friendly and has a folder with lots of interesting things to do in Rome.
The appartement is central and you can reach the city center on foot. For some place, e.g. the Vatican, it is good to go by bus. Make sure that you know where each bus stop is which brings you to the places that you want to visit. There are various busstops nearby and it is easier to look it up before you go which one is right.