Let me begin by saying I am an American living in Europe. I was surprised by all the negative comments on here. If you want a huge room with a spacious bathroom, large flat screen TV, and a massive breakfast buffet on a "Roman" holiday for this price then Caesar's Palace in Las Vegas is the place for you. If you want a decent EUROPEAN hotel room for a decent price, this is it.
The staff was helpful and courteous. The breakfast buffet was EXACTLY what I expected from a European hotel (scrambled or hard boiled eggs, bacon, cold cuts, cheese, bread, yogurt, cereal, juices, coffees). This was my 5th visit to Rome and, believe me, you can do much worse. The location (literally around the corner from Trevi Fountain and a 7 minute walk from the Spanish Steps) can't be beat. An added plus is the small grocery store across the way and the large grocery store across the main road (Tritone).
I wonder if those with all the negative comments have traveled much in Europe. I live in the nicest part of the largest city in my country in Europe, and my guest shower is the same size as the one at the Delle Nazioni. It's a tight squeeze but, hey, this is Europe.
The only thing I would say is that on many websites (but not on the hotel's official website) it says that internet is free, but it is not.