Elena is a fantastic host. She was ready and waiting for us on arrival to explain about the neighbourhood and transport, and is always on hand next door if you need anything.
The apartment is really spacious and has everything you could need, including fresh fruit every morning. There is a bus stop 1 minute walk away which gets you straight to the historic centre and all of the major attractions. For example it takes about 25 minutes to get from the apartment to the colloseum. Make sure to spend an evening in the area of Trastevere too (especially the restaurant called ale mani in pasta), which is accessible directly by bus from outside the apartment. The apartment is in a quieter area but there are lots of shops, cafes and bars nearby too for a quick drink or breakfast (for very cheap too), and an enoutmous park right outside.