There are two options. You can walk to the T-Stop for the blue line - about 0.5 miles. Or you can take the hotel shuttle to the terminal and then jump onto the Silver line which is a bus that dives into its own underground roadway after exiting the Williams tunnel. Depending upon where you are going in Boston, the Silver line may be your best option - especially if the weather is inclement or if you have luggage. The hotel is ok although I prefer the Logan Hilton because I can walk to the terminal rather than rely upon the hotel shuttle.