@SantiagoSky
They are not great for your health :(
We have a modern Defra approved ones, and burn our own seasoned logs, my husband has asthma due to lung damage following pneumonia and I can assure you it has no negative impact.
The article is pretty much supporting that as it focuses on wet wood and coal. Which is the issue, that and older stoves.
Op, I’m a fan, thr rooms heat quickly, if you use a modern efficient stove and seasoned wood it’s totally fine, but , you need somewhere to store rhe wood and If you need to buy it, it’s very expensive. So you need a wood store outside. You will also need kindling and firelighters.
I can’t comment on your cats, but for cleaning it, it’s really easy, you pull thr drawer out and tip it in a black sack, occasionally clean the glass, I use stove glass cleaner, spray on, wipe off.
Cost to install is not cheap, your chimney needs a flu and to be lined, so you’re likely looking at a min of three grand for a small one. Ours was four grand, the other was here already, we have two.
So for me, the downsides as long as you use dry seasoned wood and have a modern efficient stove, is cost to install, cost of wood, and storage outside.