I went on this ship there were two adults and a child so there were 2 single bunks and a bunk that flipped down over one of the other bunks. this was an inside cabin very small 15x9. there is a shower and small wardrobes. my opinion is i would never have an inside cabin again pay more money for an outside cabin or even a suite or go with another cruiseline like ocean vllage or p&o. where there is more room hope this helps.
If space is important to you I would pay the extra for a de luxe cabin or you could book a specific cabin for £35 and ask them for a 177 square foot one rather than a 144 square foot one....also the ones with double bed rather than singles look more spacious. Hope this helps.