The master cabin is often bigger than the guest cabins. Whether or not you want a design like that depends on how envious you’d like your guests to feel, I suppose! Some may feel more comfortable making the master cabins the same size as the guest cabins. Just remember that you need to fit in more guest cabins than master cabins! Of course, if you plan on simply sailing out by yourself, then you could consider not bothering with guest cabins at all.