Personal Housing permissions / settings / access

[Niwashi]

I did however find out that one of the community reps from the Japanese forums said the team were considering adding access to your friends list but a more definite answer would be nice.

Friends list only would be annoyingly frustrating. We need alt access. Basically, I think the priority of where they most need to add it would be:
Alts -> Eternal Bond partners -> Friends List -> other (specific) players

(That's unless they go with the pattern where full access to a house makes the game treat it as your house. I.e. you couldn't both share someone else's house and have another of your own. In that case, it wouldn't make sense as a group option like the Friends List and would only work for alts, EB partners, and specific other players you choose to share with.)