So I have Maid Celene
but the housing option to use the maid is pretty much non existant
are the game designers cheating us out of what they put in the game...
or what they claimed they put in?
Maid Celine works as "they claime" she would.
She gives you access to one (two with elite maid) extra explorations, and you can use her skill "Cheer" 3x (6x with elite) to reduce exploration time.
And you get a few buffs for exploration like +50% Credits and EXP from explorations, as well as 2x item rewards.
But you have to unlock "Housing" first by reaching level 16, iirc.