We stayed here for 5 days in December 2012. The hotel is at a great location with many of the main tourist attractions being within walking distance - Piazza Venezia, Coloseum, Trevi Fountain, Spanish Steps, and the lovely area of Trastevere is just a short walk across the river.
The hotel rooms are large and well furnished. My only comment is that the rooms could do with more accessible power sockets that stay on all the time, in order to charge mobile phones, laptop PCs etc.
Breakfasts are good with a choice of food. Evening meals are excellent if somewhat pricey. We joined the New Year's Eve party. Food and endless drinks were all included in the price. The roof level venue provided an excellent view over Rome at midnight when fireworks were set off in many parts of the city.
Finally, the staff provided excellent service. They are knowledgeable, friendly and very helpful. They all speak good English.
I strongly recommend the Fortyseven Hotel in Rome.