We spent 3 nights at the casa cartegena hotel in Cuzco, which was great. Then we went to the sacred valley and came back to Cuzco for one night, leaving early the following day. We decided to try another hotel and went to the San Agustin hotel. We arrived at 6 pm. Windows were open in our room, nobody thought to close them though it was freezing outside. Heaters were not powerful enough, we've been freezing all night. Rooms are very noisy, it was impossible to sleep anyway. We've been told that breakfast opened early. But when we came, 30 minutes after the time of opening, almost nothing was there, we had to ask for getting what we needed, and it was very long to come. Overall service was very poor. And it's not an unexpensive hotel ! This hotel is a fake. Avoid it if you can !

The hotel is well located a short walk from the main square.
The room is clean and contains the basic things you'd expect.
However, the room and hotel is a little dated, and it can get incredibly noisy if you get a room overlooking the lobby or main street.

Nice hotel for a 1 night stay befor heading to MP. Desk staff were very helpful. Helped me with a taxi and contacted the tour company I was using for MP tickets. For those going to MP, beware... Get your tickets before going as they are sold out generally several days in advance.

This Hotel was clean in a good location and the first impressions were good.
However the constant noise was a nightmare and the breakfasts left much to be desired the staff were very hazy with there english and found it quite difficult to understand us and other english guests. We and others swapped rooms because of the noise until the point we just gave in.
I strongly advise if you are traveling with llama travel to upgrade to the casa andina as the guests there said it was ok, where as the majority of hotels suffered with noise until the early hours.. Hope this is useful information.