There can't be a better location to stay in Rome. It's about 20 mins walking distance from the Colosseum and 5 minutes away from the Trevi fountain, 7 minutes walking from the Spanish steps. Everything is pretty much in walking distance. Vatican is 35 minutes walk.
Andrea allowed me to check in early due to my super early flight, so I was very thankful.
The space was flawlessly clean, and you can tell that it's well looked after and taken care of by Andrea. I can't say it was cozy because it was very cold inside. But I'm a bit sensitive to cold anyway. Even with 20 degrees outside, the flat was chilly inside. There are two heaters, but they didn't work as they, understandably, have not been turned on yet. I assume they are for the winter months. There was; however, a big blanket in the storage that helped significantly. You will want to bring your own soaps and lotions.
Another point I want to mention is that the refrigerater is a bit loud at night, making different noises. Also on one night, when I didn't sleep with earplugs, there was repetitive scratching against the wall which sounded as if it were coming from inside of the flat. It was pitch black and I knew there was nothing there, so I didn't bother to turn on the light and take a look, but I can imagine it being creepy if one is sensitive to noise. That being said, I would no doubt stay in the flat again, and I'm very happy I made the choice to stay here.