I definitely recommend this apartment. It has a small kitchen-living room, a bathroom and upstairs a quite big bedroom with TV. You can find everything you need for your stay. It doesn't have natural light, but there is a huge "fake window" with artificial light. Anyway, for air circulation there is a little window.
It is a very functional apartment, because, although it is small, everything is well organized.
The strong point is the position, in one of the best Roman neighborhood, in which you can reach all the best attractions on foot or by tram. Moreover, in 2 minutes you can reach the Tiber and Trastevere, the most characteristic neighborhood in Rome.
Finally, the landlord is very friendly and she helps you by phone whenever you need it.