Ilaria is a wonderful host - very quick to communicate and offer help, willing to be flexible with check in and check out times when possible, and her kitchen and fridge were stocked with the essentials (and some welcome extras like bottled water, Coke and a beer!). She seems a very warm and positive person, and it was a pleasure to meet her and stay in her apartment.
The apartment is exactly as you would expect from the pictures, and being split level makes it feel quite spacious and also allowed my son and I to each have our own sleeping and sitting areas.
The location is very convenient for the Colosseum - literally a few minutes walk, but just far enough to be away from the crowds. There is a bus stop immediately outside which is useful for travelling to the more central areas of the city (pick up public transport tickets either from a train station or tobacconist store) - though many places are equally accessible on foot. And the Colosseo train station is just the other side of the Colosseum.
Although the weather in July was hot the apartment stays quite cool even without turning on the air conditioning.
I can definitely recommend staying at Casa Claudia!