The best thing about this hotel is the location. It is literally 30 meters from the Trevi Fountain - on a small street with local restaurants, street markets, a short walk to the Metro, and within easy walking distance of the ancient city center, spanish steps, Pantheon, and several of true Piazza's... you can't go wrong with the location.
The room itself was large by European stds (avg by US standards), clean, modern, nicely furnished (desk, 2 chairs, internet access ($8Euro/day), safe, air conditioned, large closet). The bath was modern, but rather small. The hotel has been recently renovated.
Typical european breakfast included in nice breakfast room.
Staff a little inexperienced (no 5 start concierge here...), but know the basics. Few hotel amenities expected of 4 start hotel in the US (no pool, no exercise room, etc)- but overall a four star experience- would recommend!