Cate was very welcoming and met us at the location right when we arrived. She was also kind enough to bring us an American power adapter ( you can purchase more at a ferramenta that's just a block away for less than two euros) and was very responsive via Air BnB messaging.
The apartment is just as described. Very clean, bright, and airy with cute decor. We took advantage of the kitchen almost every day; there's a fantastic panini maker and oven, but no microwave. The wifi connection was fast and reliable. We used both rooms and both beds were very comfortable.
The location is perfect. Literally a couple blocks away from the colosseo, the palatino, and the metro. There are grocery stores just around the corner ( we liked Carrefour), several restaurants and cafes.
Unfortunately--and this is completely out of the host's control--it's quite noisy in the early morning. Not as much of a problem if you don't use the room that faces the street, but I would recommend ear plugs or noise mufflers for light sleepers.