It could just be that this time is not convenient for them. I wouldn't take it personally; other people have ups and downs like we do and offer things now but that doesn't mean they can offer it in the future or forever, etc. I would save money enough to take care of myself before I visit the city again, maybe enough to take everyone out to dinner and thank them for their interest and care last time? If you want to move there, you have to be prepared to care for yourself or you can't move; when we get old enough to make such decisions, it can cause problems such as you describe if we expect others to be involved when we haven't really discussed and planned it with them.

Maybe this time, if you are going to visit a third time, you can plan that with them and get a firm commitment, "I expect to be in town again, March 3-6th; I'd love to be able to stay with you as I'm trying to save for a down payment on an apartment, do you think that would be possible?"

It's like visiting friend or family at any time; you call ahead to ask if it would be okay to drop by, showing up on the doorstep. . . you don't know what will be happening in their lives at the moment and it can be perceived as rude and intrusive, no matter how close they are. Just as we don't want to see others all the time, at any time, without their checking on our schedules and plans, other's don't want that from us either; it works both ways. No need to take it personally, it's just normal give and take.