Maybe the P trap under the sink is not filling with water correctly and allowing sewer gas to come back in.  

Think on it, how much does $250mnth buy for a furnace, a/c, water heater, carpets, really any reno at all?

I know it can feel like uncharted waters at first.

The best defense against rats entering your property is to seal off all entry points (holes, cracks in walls), remove food sources (dirty dishes, food left in trash cans), and water sources (like leaks). 

Instead, shut off the water to the toilet and place a sign on the door "Art exhibit: Non-functioning bathroom."

The current owner is letting me take over the property as a tenant as long as I pay the water bill and the mortgage payment on it and whenever I decide I can purchase property for the balance of the mortgage  they are in no hurry for me to purchase the home as long as the mortgage is paid. 

I underestimated utilities in my early years, so I ensure those are properly captured (electricity, gas, water and trash).

If there are pets in the unit take a pan from under the sink and fill it with water so there's something to drink.

buy a house with a pool house and live in the pool house. etc. going to meetups and networking is also good. and... partnering at this point doesn't make sense.hope this helps. 

I am a bit concerned about water long term in AZ and NV.