We were enchanted by our stay at Jessy's, and we highly recommend his place.
First, the flat was well furnished and nicely decorated - be aware however that it is on 4th floor, with no elevator and high ceilings.
It was also ideally situated near the Roman Forum and the Colosseum : we enjoyed evening walks to the Campidoglio, around ancient monuments, and even to the Vittoriano which offers a (free) great view on Rome - no need to take the elevator to its top.
The area around the appartment - Monti - offers some nice places to eat (Cavour 313), have a coffee (La bottega del caffè) or an ice cream (Fatamorgana), and is quite charming.
Last but not least, we were warmly greeted by Giulia, who was very friendly and provided precious tips and cultural details about Rome, which contributed to an unforgettable stay there.