This place is awesome. I‘d give more stars if I could for the location. Trastevere is the place to be with a lot of lovely restaurants and bars. Although this part of Rome might be a bit louder, you don‘t hear that much of it since the flat is in a quite street.
One thing I‘d like to mention is that the terrace is not really private. You might share it with another flat but divided by plants. It is a private part of the terrace (you can lock it) but still divided into two parts.
Mario is quite responsive and gives you a lot of tips where you can go.
However, I can recommend this place and we want to thank both for having us.