I wish to be comfortable and happy in the home and area I live in, I would definately want to be comfortable and happy about the area the CM was in, as my child would be there all day long.
Speaking as a CM here, I am careful about the kids and parents I take on too.. it really goes both ways. If the mum/dad seems difficult (dodgy/snooty/offish etc.) then I will not sign them, even if I have the space... their attitude and manner towards their child, each other and me is important.
The rapport btwn a parent and a CM is fundamental - we play a huge role in eachother's lives. We need to be on the same page re so many things.
Always go with your gut, yes you are judging, but then there are good and bad judgements about everything in life. It's not a bad word.