The appartement is nicely located, but you must love walking as the Foro Romano makes it so that you have to go around it to reach the really touristy places.
Not an issue for us, as the view and the calm of the place made up for it.
The appartement is very chill. It does have aircon, but we found ourselves not using it. The place stays cool even without it. And this is with a 30+ temperature outside during the day.