As others have said, Luca is a great host--communicative, helpful, and knowledgable. Our previous AirBnb fell through at the last minute, and he was able to accommodate us with no trouble, even offering to arrange a cab service from the airport. We greatly appreciated his hospitality!
As for the apartment itself, it is centrally located, close to everything you could want or need in Rome. The place is a no-frills apartment, which is OK, because hopefully you'll be out and about exploring all the city has to offer! However, if you're looking for a place that feels "homey," this is maybe not the right place for you. Some other things: the apartment is spacious and high-up enough that the street noise isn't too noticeable. While I went back and forth on what to rate this place, I ultimately took off a star because compared to the other places in Italy we stayed, it was both less nice and more costly. That said, we did enjoy our stay and would recommend it to other travelers, as well.