I think the primary challenge would be to get people interested. It would be a novelty and selling the security of it, once that security had been established, would be your hook. But, the location, floating in the skies, would also be a deterrent. People will want to be where they can get to resources in a reasonable amount of time, and that is going to vary from person to person, but if they have to spend time going planetside instead of being able to set out immediately, that will present a small challenge to attracting people.
Still, the novelty and presence could be a strong pull as people see this place in the sky and curiosity works its magic. Then, the location might encourage only the people truly interested in building the sky-city to stay and that becomes a stronger city and a tighter community.