Unbelievable, unacceptable
The Courtyard Boston Downtown/Tremont is very conveniently located in the theater district. Access to I-95 is a few blocks away, and the neighborhood seemed quite safe with plenty of restaurants in the area. 
That exhausts my list of positive things to say about the Courtyard.
 As others have noted, the parking is a startling $43/night even though the garage is across the street. My room was very small, which is understandable since this is a fairly old property. What was not understandable was the utter lack of intelligence displayed in the layout of the room. The desk area that occupied the outside wall of the room had a set of 3-4 drawers along the right hand side. The drawers, however, could not be opened because they were blocked by the bureau that sat next to the bed - see the picture below. This bit of room design failure would probably have escaped my notice (I rarely use the drawers in hotels) if it weren't for the fact that the desk was not level and the drawers slid open on their own and came to a rest against the side of the bureau even after being closed. The bathroom is also extremely small - there's just enough room for the toilet and a sink. There's not even a vanity on which to place one's toiletries. Hopefully my room is not representative of others in the building. 
 In short, I simply cannot recommend the Courtyard Boston/Tremont.