Compare the plan, not just the number
Ask what the advertised area includes, especially balconies and other spaces you may not use in the same way as an interior room. Compare room dimensions and the shape of the usable floor, not only the headline total.
A narrow room can be harder to furnish than a slightly smaller but better-proportioned one. Look for awkward corners, columns and circulation space that cannot be used for furniture.
Imagine a normal day
Put your own furniture on the floor plan at its real dimensions. Leave room to pull out dining chairs, open wardrobes and walk around the bed. Then imagine two people using the kitchen and living area at once.
The best layout is the one that supports your routine after the furniture arrives—not simply the one that looks largest on paper.