Manfred is noted a lot as being considered insane but all his actions just point to him being mean and doing whatever he wants, which sounds like a basic entitled rich dude. He's compared directly to Lord Byron so I feel like it may be "romantic rogue" mad and less "actually mad"...so in other words, if he wants his girls in his house, fuck any ideas they might get about it, he does what he likes and how dare they expect more! I don't think we're meant to like him, though, so I'm fine with that.

Yeah, it's emphasized more than once she's Irish and it was all Irish girls Manfred was bringing home...it's from AQ's mouth so maybe it's meant to be prejudice on her part? Especially since she's sure to point out that wow Irish people sure are racist towards our nice black servants!