What I wouldn't do is copy those YouTube videos directly without adapting them to your space. The apartments you see are often photography studios where everything is perfectly lit and empty - nothing like actually living in a real flat. Pure industrial can be pretty harsh if you've got low ceilings like you mentioned - it'd add to that feeling of being cramped that you already have. Better to think of a softer version: keep some beams or columns if you have them, maybe some concrete on an accent wall, but balance it out with warm textures.
Where it really works is when you mix it. I've got plants all over my house, quite a few ceramic and fabric planters, and I noticed that makes industrial spaces not look like bunkers. If you combine concrete or metal with actual wood, green plants, rugs, cushions, everything changes completely. Madrid also has tricky light depending on where you are, so you need to think carefully about your flat's orientation and how natural light comes in before you commit to something so visual.
My advice is to test things out before you renovate: paint one wall concrete grey, bring in some industrial furniture, add plants, and live like that for a while. That way you see if it actually works for you or if it ends up making you sad. Renovations are expensive and permanent, so better to be sure.