Konotasaid: I don't see why this should be in your own house. Mod Osborn posted a 100% different idea than yours.
Contracts are -> building in NPC's their houses (new chairs, rugs, ...), not in your own house. So that quote from Osborn is way off with your suggestion.
Building in Anja's house is what I can support since Jagex have to use random NPC's anyway. But adding Anja in our own houses, nope, Player-owned House contracts
It says Player-owned House contracts. That's referring to our houses, not those of the NPCs.
Everything is not necessarily mentioned in his post, so there might be more in this update than what you described.
Jeremy Chengsaid: What role does she have besides giving 1coin every dialogue in the poh? Think of lore reasons. I like where this is going!
I'm going to put this in spoiler in case it gets implemented :o
Anja is the goddess of freebies. She is testing the player and checking if they are hospitable. If the player accepts the contract and completes it, Anja reveals the secret. The the player will have access to a new goddess, which enables possibilities for much more content in the future! Zamorak is Anja's enemy because they are holding a sweeper hostage at Black Knights' fortress. So, for example, the player could help Anja rescue that sweeper in the future.
Meanwhile, there will be an opportunity to bum Anja in your own PoH! That alone makes the suggestion worth implementing!