The apartment is beautiful. Martina was very easy to reach when there were questions.
The interior design is as described, very chic with a mix of modern and antique.
The location is key, it's just between Pantheon and Piazza Navona and has a little cafe next door where you can have a coffee and pastry at the bar. A little convenient store is also next door and a bigger shop is just a block away.
The only thing you should keep in mind, the house is old and narrow. You have to walk up to the 3rd floor (about 70 steps) and the apartment + shower doors are very narrow. Everything else is as described above and it was a lovely stay in the apartment.