Maria was a great host and I definitely would recommend her. The apartment is located less than 10 minutes from the Termini Station (Metro station and bus station where a bus goes to/from either airports. It's less than 5 minutes to the Reppublica metro station which will get you to all the sites you need. The Coliseum/Forum are s out 20/25 minutes by walk and would recommend walking to these locations. Also, there is a grocery store less than five minutes away and the apartment has a fridge to store cold items.
If you are looking for a place where you can step out and be at the attractions, then this may not be the best place for you as there are not that many historical attractions nearby within 10 minutes. But value wise and convenience (if you don't mind walking) is (website hidden)-I recommend walking as much as you can as you never know what you will find in that city. Also, get the Roma Pass. Allows you to skip the lines at a lot of locations and free metro.