Beyond how the property looks, check water pressure, look for signs of damp or moisture on ceilings and walls, check doors and windows open and close properly, look at the hot water system age, check the condition of the roof from outside if you can, and ask about the age of the air conditioning. Ask the agent about owner motivation, how long it has been on market, and whether there have been any price reductions. A building and pest inspection will cover things you cannot see with the naked eye.