Best stateroom for someone concerned about motion?

[MrShiny]

I am trying to get my then-70 year old mom on a 2014 cruise. It'll be our 25th Anniversary and their 50th that year.

She had a bout with vertigo after a trip to Florida several years ago. Although this had nothing to do with motion per se (caused by an infection damaging inner ear), she has never cruised and is worried about the motion. She has no history of motion sickness at all - she'll even do an occasional roller coaster.

So I'm thinking a 3 night cruise, since it's in port the majority of the waking hours. I'm guessing an inside stateroom would be best.

Other than that, which staterooms would minimize the feeling of motion? We've cruised several times and know it isn't that bad at all (although one night in Remy skirting a tropical storm was very interesting!).

Thanks!