Ask for the bottom floor with your request tell them you have 6 kids, you should have no problem getting a bottom floor unit. Keep in mind OKW has only buildings that are 2 floor and 3 floors high. Unless someone in your party has a real problem with stairs, the stairs themselves are very easy, there are about 10 steps to large landing, the steps change direction and there are about another 10 steps. You would not have a problem with strollers or anything else for that matter even 6 kids with the stairs. I am assuming you are not the only adult with the 6 kids and again that no one has any problem walking to begin with. At any rate call MS and tell them to make your reservation say bottom floor or a building with elevators which are rare at OKW. They did not have any elevators at OKW for years until they added on with the new buildings.