The house itself is in good shape, has plenty of space, is clean, and is in a good location. But it could really use some additional furnishings. Only the downstairs bedroom is furnished properly. The large upstairs bedroom has a bed in the middle of the room and nothing else but a floor lamp. There is ample closet space, but not one dresser, night stand, or table lamp. The same goes for the bedroom with 2 single beds. The downstairs bathroom is set up with a shower head, but it doesn't work, so anyone using that bathroom has to take a bath. And one of the two heaters in the basement didn't work.
I think the main issue we had with the house is the kitchen, which had a minimum amount of pots, pans, and utensils. There were enough plates, silverware, and glasses, but not much in the way of gadgets or utensils. There was no detergent for the dishwasher, and the coffee filters did not fit the coffee pot. The house had enough bath towels, but not one kitchen towel. Also, the overhead square light in the kitchen didn't work, and needed new bulbs.
I think these things I mentioned could be easily taken care of by the owners, and it wouldn't be too expensive to do so. Just some attention to details that would make this house a lot nicer for a rental.