If you're going to Rome wanting to stay in Trastevere (and spend most of your time there), the location of the appartement is just perfect. A quiet street, only a minute away from where the Trastevere action is. And if you're like me and don't mind a bit of walking, important sights like the Vatican museum, the Pantheon and the Forum are all within walking distance. Giuseppe is also very communicative and gave great instructions for how to check in (he couldn't meet me in person because I arrived much later than I thought I would). For these reasons alone I would easily stay there again.
Other observations, in random order; The bathroom is spacious and well equipped, the bed is ok (but a little squeaky on one side), I had no problems with the wi-fi (but could only find 4G while standing by the door), the TV is a nice touch, as is the small refrigerator. On my first morning I realized there was no hot water, but when I alerted Giuseppe about this, he thanked me for making him aware of it, and when I came back later it was back. And speaking of the bathroom; there is some sort of electro-mechanical sound coming from outside the bathroom window (it comes and goes), which can be something of a disturbance when you try to sleep. But don't worry! Simply close the bathroom door for the night, and you'll sleep like a baby unicorn! Also, you'll most likely hear other guests coming home in the evening/night, as the room is close to the main door, but it didn't bother me at all.
The room itself is by no means cozy, but it provides you with what you need. And you're not going to stay inside while visiting The Eternal City, now are you? :)
Can't wait to come back one day!