Location is king!
The flat is located in a lovely piazza next to Campo de' Fiori. The location is unbeatable! The area is beautiful and packed with some of the best bakeries, gelato shops and restaurants in the city. Also, this is the centre of the centre—other great areas (Trastevere, Monti, Prati, etc) are ALL walking distance which is exactly how you are supposed to get to know Rome!
The apartment is great! Lovely centuries-old building, gorgeous view, very comfortable, and, despite being so centric, calm. Next time that we are in Rome, we will 100% stay here again!