We have stayed at Trevi 41 every time we come to Rome and Tiger has always been to there to greet us, address our concerns and make helpful suggestions in a very professional and friendly manner. Our room in the anex was clean and the location couldn't be better if you like walking to and from major sites in historic Rome.
We much prefer the main building itself but at the time, there was only one room available for our 2 evenings and we required 2 rooms. Unfortunately, our mini fridge did not work, the bed, even by european standards, was not very comfortable and our shower hose leaked to the point that it was difficult to take a shower without getting the exterior (to the shower) floor wet.