The apartment is well located (about 15 mins walk from the colloseum and then a further short walk into the city centre). The Metro station is within 2-3 mins walk if you wanted to use the train- we tended to use this in the morning and walk home in the evening (we found walking past the Forum and Colloseum in the evening amazing :)).
The apartment itself is very clean and well presented, with everything you need. We were greeted upon arrival (just pushed the buzzer outside the door) and made to feel very welcome- we were given a map of the city and our questions answered- upon check out a taxi back to the airport was arranged for us.
A very nice apartment overall and a very good price.