The pictures give you some idea, but the reality is actually even nicer. The interior is small but very clean and comfortable and extremely well-equipped, down to a selection of teas and more silverware, plates and pots and pans than I have seen in many places with much bigger kitchens. Be sure to look in all the drawers and cabinets when you arrive! The terrace is amazing - with many seating choices in both shade and sun. Of course it is lovely on a sunny day, but don't discount the experience of looking out over old Rome during a thunderstorm either! The bed is large and very comfortable. The hosts were very responsive and helpful, providing suggestions about places to eat and things to do, and the on-site concierge/doorman not only answered all our questions but dropped by several times during our stay just to check that we had everything we needed. The central location means there can be some street noise, but it's very muted with the (double-paned) windows closed, or do as we did and leave the windows open for a lovely breeze at night and use ear-plugs. And the location is really worth a bit of noise - walking distance to literally everything in the historical center of Rome, groceries around the corner, restaurants and wine bars everywhere, and a nearby transit hub where you can get buses and trains to take you on trips further afield.
Overall HIGHLY recommended!