This is an apartment in an ancient building on an ancient street with everything that comes with it: the period charm, proximity to the city’s jewels, such as Navona, Pantheon, even Trevi, and... being cramped or surrounded by noise. So, you could feel being an ancient Roman (middle class, I guess) immersing yourself in the bustling surroundings and enjoying the living history of the city with every minute and every step you make, but you should NOT be tall like me (6’) or without earplugs. The city chatter lovely during the day could be sleep depriving at night; besides you will hear the neighbors above you. You could strain your lower back and probably bump your heads a few times (I managed only twice, thanks heaven) if you are tall because the ceiling is just a couple of inches above your head, and yet, the ceiling is the most alluring feature of the apartment even if it makes constantly bend your head and the back.
Of course, all these challenges are manageable with the right tools/perspective, and I very much enjoyed my stay. But... it is good to be warned beforehand.