http://www.wentworth.com/
Wentworth By The Sea is a wonderfully restored historic hotel, a well deserved Category 6. They have 'marina suites' that have 1 & 2 bdrms plus full kitchen, dining room, living room, etc. But not a timeshare. And, in addition to kids, they permit pets ... my dog loves the place - we spent a week there last year and she's going again this year (part of a Cat6 pkg of course). Twice daily maid service and an oustanding restauant on premises that also prepares the room service food. Nice spa too. Fun shopping nearby in Portsmouth ... and no taxes in NH!
Boston Custom House is a timeshare, with 1 bdrm suites only, and daily housekeeping (unless that was changed since I was last there). Parking is about $45 a day though...but you're right across from the famous Boston Wharf, the Marriott Wharf hotel (Cat7), and Legal Seafoods and a bunch of historic places close by. Tough to get on an exchange though, except in the dead of winter.
Brian