Short review: Stefano is the best host in Rome and his place is wonderful for a long stay with children!
Long review: We've spent in Stefano's place over two months with three very little children. The place is just as described at Airbnb: fully equipped, spacious, with a beautiful garden and kind neighbours. There are many movable pieces of small furniture so you can easily arrange the place according to your needs (which was an important point for us). We highly benefitted from the garden (with cats, hens, and gooses - wonderful for the children), the playgrounds (one in the garden, the other one at Via Cacciopoli), the neighbourhood (the horse stud, the plantation with its own fruits and vegetables, small hill with the ancient ruins). The challenges of this place were the staircases (but even with very little kids we manage to keep everyone safe - it looks more dangerous in the pictures than it is in the reality) and the communication with the city (we had our car which definitely made many things easier, but as long as you have time you can use the public transport to easily get to the subway). This place offers a unique perspective for Rome - without traffic, crowded pavements and tourists so we highly recommend it.
Stefano and his brother Gabriele were extraordinarily kind and helpful to us. Stefano answered patiently plethora of our questions, he intervened anytime we had any requests, he explained all the details concerning not only the place itself but also other questions relevant for the guests from abroad. He even had the gifts for our kids for Befana - this is definitely not something you expect from a host! The communication with Stefano was perfect and I am hoping to meet him in the future again while visiting his place.