Growing in an old flat with ovens

you wont have any issues due to the ash or the oven, just a few things will be different. First off the humidity will persist even during flower, this is actually a good thing but you do want to control pests and mould, i do suggest getting something called bacilus thuriengiensis at the garden shop, these are microbes that eat mold and pests . Second this is that the ash might get on the weed. this is no major , but you might want to check out a technique called bud washing for when you harvest, this is the best way to cure and dry the weed anyway, but for you it will really help aswell. hope this helps ! 🚀