My husband, 2 yr old son and I just returned from a 12-day Norway voyage on Hurtigruten's Richard With.
Cabins - We splurged and booked a mini-suite so we'd have more room with our son, and this gave us more than enough room to move around. You can request a crib at check-in if you need one (they will only fit in a suite), though rental is hefty at $25 per day. We decided to share a bed. Our mini-suite was well laid out, with a curtained off area containing a comfy queen bed. This allowed us to put our son to bed, and still have the main area to enjoy the evenings together. Suites have a TV and minibar which was handy for milk and other snacks for our son. A lovely fruit basket was provided to us when we boarded in Bergen, and was refreshed again in Kirkenes. We were also given Hurtigruten coffee mugs, allowing us access to coffee/tea at no charge 24/7 throughout the voyage which was handy and saved us some money.
We had cabin 636 which we felt was one of the best located on the entire ship (640 is just as well located and significantly larger). We were below the quiet outdoor deck area and on the starboard side, so we didn't hear any loading/unloading of people, cars or cargo which took place on the port side at each stop.