Size: 107 sq. m, 3bdrm, living room, kitchen. 11th floor, balconies with beautiful view. One fairly large, little coffee table + chairs possible. Central heating from the local coal power plant (pricey - up to 250 euro/month in peak winter months but does excellent work), south/west facing.
Cost: Approx. 9.75 JAFI, possibly up to 12 JAFI with full repairs (insulate the walls, bathroom/WC is in terrible state and needs complete reno, ditto kitchen, etc.). Net worth: 25JAFI. So cost is 50% NW.
Steady income: ?? - corona: job prospects unknown. Also, the fact that I have worked abroad might mean I don't have the exact paperwork required for a mortgage and/or might mean a higher interest rate. Mortgages here are variable. I would rather make a cash offer.
Do I like this property? Yes, I do. Do I need this much house? As a single male who is likely to remain so, highly unlikely (town is not a major tourist spot so any, say, AirBnb income from renting a spare bedroom might be fairly occasional). Can I afford this much house? Eeeeeeh, very much debatable, especially by ERE standards.
tl;dr: I want it, but it's too much house. Pricey, but good property - but too much house. But I want it

Edit: another option I am considering is a studio in a good, but way less ideal location, which costs 15% of NW + probably 10-15% additional needed in repairs (tiny, so space-saving furniture will need to be designed, full bathroom/kitchen redo, possibly with walls moved, windows replaced, etc.) I estimate 25-30% of NW in total.