I am assuming his old maid will join him after he thwarts her attempt at killing the demon lord after hearing his side of the story. She seems reasonable and most likely used her whole “I’ll kill him” thing to be able to get there…only thing I am not currently sure on is why she is attempting to kill Lilith, but I guess we will see in the next chapter.
The maid also seems devoted to him and he would love to have her there since he has thought about her AND wondered if things were bad for her because of him. Besides she seems to genuinely want to serve him.
As for his working conditions I would think she genuinely wanted to provide him a good and fair place to work but really didn’t think through how to make it actually happen…silly demon lord.