Windows – Look specifically if they are facing the right direction to let sunlight in, and whether they open to a nice view (versus directly toward another neighbor’s window).
Under the Sink Cabinets – Check for possible signs of water damage due to leaky plumbing.
Electrical Outlets – Make sure there are enough outlets for the appliances and other electronics you’ll be using. If not, you can decide if that’s a renovation you’d like to make.
Storage Space – Don’t just look to see if there’s enough closet space, but look for closet placement. Also check that the storage is in a convenient location.
Appliances – If they’re included in the house, make sure they’re in good condition. They should be on and working while you’re there.
Under the Rugs – Lift up any rugs to check the condition of the floor underneath.
Floor Level – Check to see if the floors are level. Place a marble or another small, round object on the floor and see if it rolls consistently in one direction.
Attic – If the house has one, make sure it’s well insulated.
Water Spouts – Runoff from the gutters should be pointed away from the house, so take a step outside to see if this is the case.
This list isn’t all-inclusive, but it’s a good place to start.