Just spent 3 weeks in Orietta's apartment (in Rome for work). The apartment is pretty much exactly like in the pictures - it's not luxurious, but it is bright, clean and comfortable. The ad describes the apartment as "tiny", but I think that is being a bit hard on it - it is compact, but there are many hotel rooms in Rome that are an awful lot smaller. For one person it was fine (although it would be a bit squeezy for two people, for more than a few days).
The apartment doesn't have a washing machine, but there are a number of laundromats within a few minutes' walk.
And speaking of walking, the apartment is in a tremendous location. Heaps of restaurants and bars on your doorstep, and you are within easy walking distance of lots of sights such as the colosseum. It's also a 5 minute walk from Roma Termini railway station.
All in all I was very satisfied, and I'd be happy to stay there again.