This apartment was wonderful. The location is fantastic and everything is extremely walkable from it. We walked to every major highlight in Rome from the apartment.
It is quite literally a 2-3 minute walk from the trevi fountain and is a great way to see it since you can go anytime to try and beat the crowds. My recommendation is to go late at night which is very beautiful. It also rained while we were there, so we used the umbrella that was provided by the apartment (very nice touch) to go to the trevi fountain and we were pretty much the only ones there.
As far as the apartment goes, everything was great! It was very clean and had everything you could need during your stay. The beds, sheets, and pillows(memory foam and normal) were all very comfortable.
The check in and out process was very easy and we were greeted upon arrival and when leaving since we left at 10:00am. When checking in we were given lots of valuable information of what is in the area!
Would highly recommend!