Our stay was great: great location - in the center of a busy neighborhood but on a side street, so no noise at all; we felt safe; we mostly walked towards the center, but there are bus/tram close by that will deliver you at the city center or at Vatican.
The sofa could be more comfortable- the pillow seat kept sliding away. To compensate, the beds were super comfortable and we slept really well.
There was an issue with the water heater, but Massimo was quickly on top of the problem.
Overall, I do recommend Carla and Massimo’s place and would return!