Okay, um, let's see...

I'm beginning to think some things I thought weren't relevant to this RP for the setting might be a good idea to have something about. ^^;

While a normal person could see the detective agency if deliberately aided by someone supernatural, they can't on their own. Toshiko is careful not to allow normal people to perceive the agency or come close enough that they can touch it. While a house could be haunted, it kind of depends by what(there are anything from spirits to ghosts to poltergeists and all of them are different). Demons don't possess things in this setting actually, mostly because they are very much physical living things.

Toshiko doesn't listen in on emergency phone calls since she doesn't exactly have the means to and it's not something she'd like to be caught doing. A battle at a house could happen, but as the supernatural is a secret wrecking it would be an outcome to be avoided.

While it's possible for someone from a former mage family to be unaware of any magical ability possessed by them, Angels as an affinity does not work. And, well... there's really only one type of angel that could be a "guardian angel' in this setting, and they're not technically angels and it would basically just be one of them deciding to protect someone. All the other angels are to put it simply very strange and seeing one on Earth is a bad thing.. Holy abilities and divinity cannot be granted by magic, though certain holy items have spells designed to replicated their effects(the Shroud of Turin is a divine defense mechanism, there is a spell that mimics it a closely as possible).

Finally, Hell is less a realm of evil and more a rip in the fabric of reality caused by a bit of a complicated event. There's not really any kind of plane of evil at all, there's some bad stuff but that's just in the regular world.