We stayed at the Greenhouse for three nights. We were impressed with how central it is; you can walk to the Colosseum in around 5/10 mins. While the Greenhouse is based in central Rome, you wouldn't know it. The area is so quiet and peaceful!
In terms of the room, we felt it was cosy and clean. We also appreciated the little extras including the pastries, biscuits and coffee pods. The garden is also nicely maintained and a great place to hang out.
Finally, Valentina is a great host. She was extremely responsive and helpful during our stay. We'd therefore highly recommend staying here if you're looking to book a city break in Rome.