i've stayed at the westin waltham twice in the past two years. it's a good property offering nice rooms, good food and attentive service; you will not be disappointed.

i don't remember it being a short or convenient drive from the airport, however, especially when navigating at night in unfamiliar territory. get explicit directions: i remember a couple of unusual and unexpected turns that have to be made once you leave the highway. (you can see the hotel from the highway, but it's somewhat difficult to find once you get off, unless you know exactly where you're going.)

i've also stayed at the westin in providence... it's also a fine hotel. my recollection of the hyatt in cambridge, by the way, is that it does offer free parking.