Stayed 3 nights and was welcomed by Carmella who provided us with good information and map. The room was big enough for 2 and it was clean, comfortable and had air conditioning. Gianluca provides yogurt, snacks and cereal which is nice if you don't mind a simple breakfast. The apartment is really close to Roma Termini which is nice when you have suitcases. There is a small elevator and it's within walking distance of many places to visit.
The only negative is that the area around Termini doesn't look really nice but I did not feel unsafe. There were some minor things to fix in the bathroom also.
Overall, I would stay there again.