My electricity is 0.0575eur/kWh and I live in a apartment building which can get pretty cold specially at winters -- would it be a bad idea to invest in a mining rig these days? It could warm up this flat im living in at the same time
Yes, it's bad idea. I wouldnt advise anyone to start mining, especially if you have no experience.
Another thing, if you get for free or very cheap the equipment or its part . Otherwise, it will end up selling your farm

That's the perfect answer! People should come out from thinking that mining is an easy way to earn money! Mining has a lot of things to know! Therefore it is not safe for everyone! Without proper experience and guide, anyone can get harm to the house or people! I will never forget what my fellow friend did! Now, Mining bitcoin is like a nightmare for him! So, I would suggest too that if you don't have mining equipment then don't buy, but if you get from someone then spend 6 months to 1 year to know its proper usage!