I recommend a balcony cabin as it feels alot bigger and open compared to an Inside cabin.
Only problem there, with a 4 day cruise you're generally talkin Fantasy-class ship. Only balconies are Cat 11 + 12 suites and much more money. What we mean here Angie, newer ships get the longer routes. Newer ships have Cat 8 balcony staterooms reasonably priced. Unfortunately, Fantasy-class ships run most the 3-5 day routes and don't have Cat 8 cabins available.