I spent an excellent in Rome with family in late May. The fact that we stayed in this apartment definitely made a huge contribution as everything went smoothly and according to plan giving us the possibility to fully enjoy the three days we were in town.
The location of the apartment was perfect: only a few meters from the entrance of the Vatican museum (do book ahead on the internet to avoid the long queues) and St. Peter square.
There were plenty of options for public transportation so reaching the rest of the city was easy and quick (you can actually go on foot to the main central sites such as Piazza del Popolo and Piazza Navona if you don't mind a 20 min walk).
Around the apartment there is ample choice of restaurants and little places where you can eat as well as a small Carrefour supermarket.
The apartment itself is exactly like you see in the photos. It is quite big, comfortable, very clean and airy. With lots of light and nice views over a pretty inner courtyard.
There are two rooms/bathrooms and a spacious living room. We were four adults staying and it never felt crowded. The kitchen is very nice with everything you might need.
The building is also very well kept and quiet. The elevator of the building is small so you might want to take this into account if you are planning to have a baby buggy. The apartment is on the 4th floor.
Gabriella is extremely nice and helpful. She will give you all the necessary information for a pleasant and carefree stay. She's also very accommodating in terms of check in hours and ready to help whenever you need.
I will undoubtedly recommend this apartment to anyone who wants to visit Rome.