We did not get to meet Dario in the guesthouse. A lady checked us in and showed us the room and amenities. The room was clean and as described in the Airbnb. We got the black room and is close to the shared bathroom. The night experience was poor as someone was trying to shave and it was very loud and noisy - we had to leave early next morning to Rome and really needed some sleep. I would suggest if the host could inform future travellers to make minimal noise as possible during the night time for a better experience.
Overall, it's a good place to stay for solo or couple travellers and is central to SMN station.