Well, since occupancy for anyting under a 2 bedroom is only 4, I'm guessing that's what you will need. MS has been allowing 5 in a 1 bedroom, but they will NOT allow 5 in a studio. It really depends on who is in your group and what your bed requirements are. If you are a couple with 3 small children, you might be able to get by with a 1 bedroom and have the 3rd child either sleepin the pac-n-play (if small enough) or an air mattress if not. If you are a couple with older children, get the 2 bedroom because you will then also have 2 bathrooms!