To start off simply, it was an awesome stay. Roberto was a great host from the start!
The house itself is more on the upscale side, and extremely comfortable. I personally loved the bed and how comfortable it was - a must have for people who do sightseeing all day!
The kitchen and bathroom is fully equipped, maybe even more than a basic traveler would need. We didn't cook but definitely used the kitchen for preparing some paninis to take on-the-go.
Location is amazing! One may seem that it seems far from Campo d'Fiori or the Colosseum but it doesn't take long to walk -- 5-10 minutes to CdF or 20 minutes to Colosseum. Rome is a city made for walking, so I suggest you take the trip. Oh also Vatican City is right around the corner, literally a 2 minute walk.
All in all, I loved staying at this house, the host was great, and simply I had zero reasons to complain! Suggest highly to everyone!