I had a very pleasent stay - clean room, nice shower, good AC, safe area also at night. All I want from a good hostel. Would choose the hostel again.
Location: The colosseum (closest main sight) is about 15 minutes walking distance which can be quite exhausting in the summer. But a metro station is nearby in case you don't want to walk or escape the heat.
Communication: On the day I left, I wanted to store my luggage at the hostel instead of carrying it around the city. It is possible and cheaper than at the luggage deposits near the train station. Currently they have a problem with the storage boxes so they use a spare room on the ground floor. However, due to the weather forecast I was told that they need the room from 5pm onwards for the bar (usually rooftop) and I have to pick up my luggage before. It did not rain in the end and I could have explored the city a bit longer. Not a big deal, but a detail that could be improved.