This is better than the photos could possibly convey. The location is simply unbeatable. It is loud until about 11, but not obnoxiously so. Comfortable beds. Spacious. Enotecca literally next door is also a plus to grab some nice wine on your way home.
A lot of other iconic sights are within a 5 - 10 minute walk (e.g., Pantheon, Trevi Foutain). Spend the money . . . its worth it.
Oh, you cannot drive up to the property without a special pass, which you can't get, so take a cab to the property. Also, the front door is a rare spot from which you can hail a cab in Rome after 8 am.