The Hilton at Logan Airport is one of the most convenient hotels I've ever stayed in. Having an International flight, I was able to walk to the terminal via a climate controlled walkway. Alternatively, they had vans continually running 24/7.
I liked the atrium feel of the lobby (complete with trees). Connolly's is their pub which serves many excellent beers on tap (Harpoon, Sam Adams, Guinness, etc.). Berkshires is their finer dining facility (I recommend the crab cakes and the real clam chowder). It has an excellent health club that offers massages and a ""waveless"" pool. It's also only five minutes outside of downtown Boston!
Pros: Convenient, Luxurious, Modern
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