Get a room in the back!
We've stayed in the Excelsior twice now. The location is great and the amenities are very nice, including breakfast in a lovely roof-top restaurant. Last year we had a quiet room on the back side of the hotel and thoroughly enjoyed our stay. This year, however, our room was on the front side and there was a lot of noise from the street all night long (think garbage trucks at 04:00). So, if you are a light sleeper be sure to ask for a room on the back side of the hotel.