The short short review summary: I will 100% book here for my next trip to Rome and would go so far as to adjust dates of my trip to be able to stay here.
The longer review: Congratulations, you have found the perfect place in Rome. Guilia (Andrea's daughter) was as gracious a host as can be (AirBnB hosts should take lessons from her). From Check-in to check-out there wasn't anything she couldn't answer for us or provide a recommendation for, including helping to book our early AM taxi to FCO, her basic printed guide book with breakfast, lunch, and dinner recommendations, and local tips to help us get around.
The loft apartment was exactly as advertised. It was clean, impressively decorated and renovated with a new bathroom. The bed was very comfortable and sleeping was undisturbed even with windows open. There is a small kitchen with mini-fridge (by US standards), sink and stove. The only bit of caution I would offer is there is no elevator. You should be comfortable with carrying your luggage up 3 short flights of stairs.
It is centrally located and just one street off a main road and very conveniently located to walk everywhere:
10 mins to Campo de Fiori (amazing food, good shopping)
15 mins to Vatican City
15 mins to Pantheon, Trevi Fountain
20 mins to City Centre (& Roman Forum)
25 mins to Colesseum