Did the job
Wanted a reasonably inexpensive hotel not terribly far out from Boston. The HIX Boston fit the bill. Easy to get to off I-93, and close to the Andrew Red Line T station, which they shuttle to/from.
Other than that it was what you expect from a good HIX. Clean room, free parking, and a OK enough free breakfast. 
As for highway noise, I stayed on the north side, facing I-93, and did not notice it at all.
I would stay here again.