Paola's place is great if you want Rome, but not IN Rome. It's about 15 min walk to the train station and from there 20 min to the center of Rome. The same 1.5 Euro ticket will allow you to transfer to the Rome metro. Paola's place is very comfortable with all you need to have a great stay. Ostia Antica itself is a charming place and a nice quiet rest after the noise, dirt and bustle of Rome. People there are friendly and local restaurants have great food. Do not be afraid to drink from any of the constantly running fountains in town. Don't miss out on the Ostia Antica Archaeological Park. To me, it beat anything you can see in Old Rome.
Paola is charming and is willing to go way out of her way to help make your stay enjoyable.
The one caution is that it is difficult to get to Fiumicino Airport during the hours between say 2200 at night and 0500 in the morning. Be ready to pay about 40 euros for a taxi. The best way is to book a flight late morning or afternoon, then you can take the train straight from OA to the airport for 1.5 euros.