Since your intention is to live in this, my advice to you is to test all the systems before you purchase.
Although I imagine it is very cold where you are; try to test the water, electric, and gas.
Ask to have the refrigerator and air conditioner operable.
Arrange ahead of time to have the furnace running and the hot water heater operating.
Check all the faucets. See if there are any leaks. Fill the holding tank(s) to see if they leak
See if the stove works. Try all the cabinets and drawers.
If the present owner has facilities for hook-up to water and gas, inquire if he would be kind enough to do this ahead of time.
If everything works, be fair with the Seller in regards to his asking price.
If not, determine the value of repairs and go from there....