We stayed here with a one year old toddler for 3 nights in September. Chiara was so easy to communicate with and was extremely responsive since I started being in touch with her about a week before our arrival.
The size of the apartment itself was perfect for my little family. We used up the main bedroom and the sofa bed in the living area. However I do think the sofa bed needs a change as the mattress was not very thick and you will tend to sink in the middle. Also, we could feel the spring while lying down on the sofa bed. It was a bit difficult to shower a toddler in the toilet but when travelling all you gotta do is improvise! The washing machine came it handy with detergent provided, kitchen utensils complete, towels provided, wifi worked excellent. There was also a small lift in the building which eased our burden of walking up 4 flights of stairs with a stroller. The area itself was smack bang in the middle of Trastevere with access to unlimited restaurants, 200ms from the San Cosimato morning markets where we stocked up on fruits, 200ms from a playground and approx 300ms from about 3 supermarkets. Couldn't get any more convenient than that. Chiara checked up on us almost everyday of out stay, which was really thoughtful and also kindly helped us book a taxi for our ride to the airport. We would definitely stay here again!

p/s if you have kids its worth taking an evening stroll to the Piazza di Santa Maria where they have plenty of street performers which will keep both kids and adults entertained.