I've personally stayed at the Westin Boston Seaport, Aloft Boston Seaport, Element Boston Seaport, and the Renaissance Waterfront Boston.....most recently the Aloft back in April of this year.  There are other hotels there, but I haven't personally stayed in them. The hotels are pretty close to the port....a few blocks from the Hampton Inn mentioned above.  I'm not sure how the walking to the terminal itself would be with luggage, but a taxi/uber/etc wouldn't be too much.  If you're flying