Although we never actually met Jacopo, we chatted a good amount on Whatsapp. From the very beginning, he was a responsive, friendly host, and throughout our stay he did his absolute best to make sure we had a good experience at his place. As for the room, it's clean, has good wifi, and good AC. Those things alone set it apart from most of the rooms in Rome, not just the rooms in this price range.
The neighborhood in Pigneto is a little far from most places in Rome, but the area right outside our door we found to be delightful, so much so that we ended up spending lots of time in Pigneto because it was (in the end) our favorite neighborhood in Rome.