Sometimes cheaper since no solo supplement. I personally wouldn't book one on purpose. I booked a inside gty and am solo and recovering from a broken wrist. The cabin assigned was like 105 sf and a twin bed. I'm sleeping with a stack of pillows to elevate my wrist. I no showed .. for me impossible and 1 loyalty pt not 2 for solo cabin. Another time I might have gone, but still didnt agree it was a possibility with inside gty.
To select a solo cabin, have to go in with 1 pax. If still cant, it could be booked.