I've had rooms front center, back center, and center left.
I never had problems forward or aft.
We experienced a lot of rocking movement with the room that was center left.
But there's a lot of variables involved with motion (weather, route, wave action, etc) - so I'm sure our experiences with motion are different than others.
But as to the room itself, It's a normal room except for the slanted wall and view out of the portal. It's a nice view - though I thought the portal would be a bit bigger. Our cruise after this one, we went aft with a veranda and would take that any day over the front.