It's not comfortable.people need to be under no illusion. The ship is a Ferry! But I think the descriptions in brochure are very fair. We had the best outside cabin and the bunks are very narrow. The cabin is not somewhere we wanted to spend any time. We went with hopes of seeing the Northern Lights and were lucky. There were glimpses from the ship. We were in Tromso overnight but did not pay £90 each for a trip to view them. We caught a local bus to a country park and saw the lights from there. £9 all in!
The buffets on board are excellent but the waited on dinners are a waste of time. There's a lot of fussing and ceremony for tiny portions and usually cold ones. I would say book Breakfast and Lunch. Take snacks for evenings! You can take a Travel kettle and teabags etc.Also take mugs. The 'deal' of buying a mug and being supplied with endless tea or coffee is very expensive for a toilet roll inner sized mug!!
The interesting part of the voyage is that the ship is really a working ferry and foot passengers and local people use it a lot. It does go into small inlets and ports that bigger ships can't reach.
It did what it said on the tin! Very small. Bunks narrow. Not somewhere you'd want to spend time.