Start with scale, not labels
Room labels tell you the intended use; dimensions tell you whether it will work for yours. Compare the lengths of walls to familiar furniture and check whether the stated area is plausible for the room shape.
Follow the route through the home
Trace the path from the entrance to the kitchen, living room, bedrooms and bathroom. Notice through-routes, narrow halls and doors that compete for the same space. Good circulation is easy to overlook on a small drawing.
Look closely at doors and windows
Door swings affect usable wall space. Windows hint at light and where furniture can sit, but remember that a plan rarely tells you the view, sill height or how much light is blocked outside.
Find the storage before you fall in love with the rooms
Mark cupboards, utility space, eaves and built-in wardrobes. Then ask where everyday things would go: coats, vacuum, laundry, luggage and recycling.
Take a short list to the viewing
Use the plan to prepare specific questions: Does this door open that way? Is the alcove deep enough? Where is the boiler? Are the room dimensions internal? A few focused checks make a viewing far more useful.