The location is superb and Dunia is very responsive and kind. There was a mix-up at first (possibly due to a change we made at the last minute because of a change of the departing flight by our airline), and we had to spend the night at a different apartment (that was okay, had a roof terrace, but we liked it less). Dunia compensated us for that night, which was very fair. The place near the trevi is great and we were able to drop there for rest in the middle of our day out -- it's such a fantastic location.
A few things need fixing. Curtains on the windows were missing which meant we woke up earlier than planned and lacked privacy (one morning a neighbor was right outside our window tending to her flowers). A few things were missing from the place; some we asked for (coffee machine), and some we didn't (basic cooking ingredients).
But all in all this was a very good stay and I'm sure Dunia will fix the small things and make the place perfect as it can be. I would recommend this place.