If you have a car, this is an adequate place to visit both the Rome city center and Ostia Antica. If you are traveling by public transportation, do a search from the Acilia train station to Rome city center. From the apartment to the train station it is a good 15 minute walk and then at least 40 minutes to the colosseum; an hour to the Vatican.
The apartment itself is very well stocked with a full refrigerator (it broke down during my visit, but was being repaired when I left), stove, oven, microwave, teapot, etc. Sabrina left me all sorts of goodies to eat and snack on. The bed is very comfortable and there is plenty of room to hang clothes. There is a washing machine and dishwasher, which is unusual in my experience. There was an odor throughout the apartment but may be due to the refrigerator going out.