My husband and I had a great stay in Marta's apartment while we spent 3 nights in Rome. The location is fantastic, it is just around the corner from the Pantheon, you easily can walk to several great restaurants, and is central to get to the major sight-seeing locations in Rome. It is about a 30 minute walk to both the Vatican and Colosseum.
The apartment is extremely stylish, modern, and quirky. Stocked kitchen with cooking essentials, flatware, and dishes, spacious bathroom, and overall a good space for a couple to stay. It is also extremely quiet, you can barely hear anything from the street below. Also has a great shared rooftop, from which you can see the Pantheon and Colosseum. Elevator in the building is key as it is on the 6th floor.
One thing to note, the big beautiful Roman door to enter the apartment building is extremely difficult/tricky to open and became a point of stress during our stay (this is of course not the host's fault). I suggest practicing opening the door while checking in to make sure you are comfortable before left on your own.
Overall, a great experience!