The apartment was perfect for us (couple with 16 years old son) as it provided space to be on our own. We enjoyed the location in a non-touristy area and felt like Romans ;-)
Our first stop every morning was the coffee shop down the building and then headed to the nearby tram no 8 that is just perfect to all main sites (or connecting on Piazza Venezia).
The terrace is indeed huge - due to the heavy morning sun in June only more enjoyable in the evenings though (but then we were out anyway).
Communication with the host was easy and very reactive!