I had an amazing stay at Giulia's. I seriously felt like I was in a small hotel, but with the nice human touch of an airbnb host. To be honest I even felt guilty for sleeping in longer than ussual and staying at the flat; it's that confortable.
As soon as I arrived I saw Giulia had all the details taken care of, she even helped finding train timetables for my return. I find that Campo dei fiori is the best spot to stay in town, it's exactly at the center of everything (15minutes to vatican, 20 to Colisseo, 10 to Trevi... etc), and it's a neighborhood with a lot of charm. The square is very lively, but I couldn't hear a sound once I closed the windows (there's also air-conditioning in the room). There are plenty of great dinner options, I particularly liked La Fiaschetta and Ditirambo, which are 1 to 5 minutes away. Trastevere is 2minutes away, crossing the Ponte Sisto, and it's a great place to have a panino and gelato for lunch. It's very nice.

Giulia is very friendly and energetic while not invasive at all. She made my stay very confortable and I'll be sure to come back as soon as I return to Rome!