Apartment was exactly as pictured, small but perfect size for 2. I wouldn't say it's kid friendly due to the stairs and the loft area doesn't have railings.
Valerio wasn't available when we checked in but we were met by a friend who was waiting for us outside & showed us everything. Area felt safe, there is road noise. Very small but stocked kitchen (we explored Roman cuisine).
Neighbor was very particular about parking; you need to park exactly in the parking lines and he was adamant that you can't drive to the end and turn around to exit -- you need to back out into the road. Otherwise he was a kind neighbor who we enjoyed talking to.
Super happy with this find overall, very clean, a lot of attention to detail, free parking is a huge bonus. Walking distance to metro, Colosseum and a lot of sights. Uber from Piazza Navona (1h walk) was easy!