About the room; the bed was super comfortable, there was a welcome ventilator at the ceiling that was very silent, the window is musqito proof and the bathroom is equiped with a foot bath and a rain shower. In short, I was totally surprised by how well I could sleep in 36 degrees Rome for only so little money. I also told Sergio this (I am sorry guys :) ), I think he should ask for a higher price!
About Sergio: he is incredibly kind and likes to try to have a conversation with you although your Italian is quite poor. He does not give up easily when you don't understand something that he is trying to explain. I really liked him for that, plus the fact that he brings you breakfast in his cosy living room. He gave us way more of an 'Italian' experience than you could get by staying in a hotel or hostel :)