Unfortunately, when heating was a problem, the owner (not Carol) came with a technician to resolve the sink not draining. He told me the heat was controlled by the door man (portiere). By that time, Day 2 morning, it was on. However, when we returned in the early evening, it was off again. Night 1 and 2 were very cold. A message was sent with the problem but no response and no resolution. We had planned to stay 4 days but we left on Day 3 because the unit was so very cold and we did not feel comfortable.
I would suggest that if the owner plans to rent a unit during a holiday and that they need to respond to the problems emails or networks and have a plan in place to ensure the heater or anything else is working properly. I am sorry I am being harsh but this situation really ruined my visit to Rome.