Location, location, location...and more! The location is perfect. It is across the Piazza from the Spanish Steps. Good news - once inside the building, it is quiet, and you wouldn't know you are in such a popular area. You can walk almost everywhere, and there is a Metro 3 minutes out your front door.
The apartment itself is great. We spent a lot of time in the living room with comfy couches. There is a lot of closet space in both bedrooms, well-appointed kitchen with oven, stove, microwave, washing machine, plenty of dishes. It is helpful having two bathrooms (the master one is smaller than the other), and there was always enough hot water. It is clean, all the beds are comfortable, second floor with stairs or elevator.
Although it is a touristy neighborhood, there are several grocery stores within a 5-10 minute walk. There are also many good restaurants within a 5-15 minute walk.
We highly recommend it and would return for sure!