Ostia is a great place to stay at, especially if you want to explore Lazio by car. This location has lots of free and safe street parking available (at least in February and March during our visit). Rome is close, only 30 minutes by the Rome-Lido train, and a 100-minute ticket cost a whopping 1,5 €. You'll walk to the Lido Centro station in 25 minutes.
The house was great, a bit chilly at times though but it was wintertime. Nothing major at all, don't be scared. Everything worked and we were able to cook in the beautiful kitchen. There are several good supermarkets around where you can buy good quality food, so take advantage of that.
If you have a car, do visit Anzio, Cori, and in you like shopping, the Designer Outlet at Castell Romano.
All in all, great place, a great host, and a great stay. We'll be back.