The apartment is nice. It is situated in the heart of Rome. All the major sites can be reached by foot from there. The roof terrace is quite nice and must be stunning in the summer (we were there in December / January).
The kitchen utilities are rare. There is a capsule machine for coffee but no water boiler. You should consider bringing your own silverware as there is just two forks and one large spoon.
The toilet broke twice but at the first time was repaired at the same day and the second time was the night before our departure.
All in all I can recommend this and we had a great time there.