Okay so this is the first time in a single ( studio room). I have to say I am sold. even though I was traveling with a friend we chose studios for the privacy. ( Also we each got onboard credits and a full size bed.)The studio was surprisingly adequate for a 7 day cruise. I'd say bigger than a dorm room but smaller than a balcony room. Everything was easily accessible including the sink and bathroom. There was a nice HD tv in the room and lots of closet space. There was a weird window with a one way shade but from the outside you could still see a silhouette in the room.
I met a lot of nice people who were what they called "solo" travelers that had access to the studio lounge. This lounge had snacks, a bar ( only open 5-6) and a concierge.Many of the solos as they called themselves were repeat solo cruisers and knew each other from previous cruises. This was a nice touch to have a place to casually meet other folks on the ship. So not only do you get the privacy of your own cabin, you get the social activities of the lounge.