Two of us stayed at Elisabetta's place for a week over Christmas and we loved it. It's a quaint old home that has everything you need. Elisabetta and Miel both responded promptly to any questions we had and were very understanding when our flight was delayed by a few hours.
The heater didn't work very well while we were there and wasn't consistent. Miel apologized for this as it was difficult to get a repair person out for the holidays.
We used the kitchen a lot. It didn't have basics like oil, pepper, etc. (it did have salt and sugar), but it came with plenty of pots, pans, and cutlery.
Everything else has already been mentioned by other reviews. It was a WONDERFUL location. We really fell in love with Trastevere while we were there, especially with the help of Elisabetta's tips and recommendations.