I'm very sad to say that we didn't get a chance to enjoy our 2 night stay at Marco's unique property due to the fact that our flight was canceled on the evening we were due to arrive. I still wanted to leave a review though as Marco and Angela couldn't have been kinder and more helpful. When I said that we had booked a new flight for two days later they offered us the following two days at no extra charge. When I told them that it was impossible due to other commitments, they refunded one of the nights (which they were not at all obligated to do) in order to (in their words) "reduce our displeasure".
Needless to say their acts of kindness did in fact take the sting out of a bad situation, and the next time we are in Rome we won't hesitate to book il muretto.
I would highly recommend them as hosts to anybody, they are lovely people.