Nice winter stay?

Hello. Looking for a very nice place to stay in Portsmouth for a weekend, late January or early February, for a simple getaway. (We're in Providence RI and love our city but feel the need to go somewhere!) Ideally we'd like a pool or a hot tub that's open even in the depths of winter.

I know 'Wentworth by the Sea' is out there... seems nice... seems like a chain. But that might be ok too, if it's actually a nice place.

If you wanted to splurge a little in your Portsmouth, where would you go!?