Depends on where and local laws. In San Francisco you can swap roommates out one for one and they landlord can not reasonably stop you. They can request an application if they want but they can’t reject them unless they have a very good reason. Most landlords don’t bother to waste their time.
You need to make sure it covers that altitude. They top out around a certain altitude in the fine print you usually need to pay a little extra for altitudes like Kilimanjaro. Make sure it has helo evacuation covered for all altitudes.