Greta’s BB is great. The bed is the best we’ve had on our citytrips and the room is really clean.
We did not meet Greta in person, but the communication was very good. The self service check in was really easy.
One minor point: the light in the bathroom turns off automatic, so during a shower we had to open and close the shower door a few times for the sensor to react.
The location is good, right next to the Vatican. But other places like the center or Trastevere, were a bit further.